{"id":"CVE-2026-24052","aliases":["EUVD-2026-5172","GHSA-vhw5-3g5m-8ggf"],"status":"published","title":"Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains","description":"Claude Code is an agentic coding tool. Prior to version 1.0.111, Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a startsWith() function to validate trusted domains (e.g., docs.python.org, modelcontextprotocol.io), this could have enabled attackers to register domains like modelcontextprotocol.io.example.com that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. This issue has been patched in version 1.0.111.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00432,"percentile":0.37853,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2026-02-03T19:15:59Z","modified":"2026-06-17T10:22:31Z","fixes":[{"ecosystem":"npm","package":"@anthropic-ai/claude-code","fixed_in":["1.0.111"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@anthropic-ai/claude-code","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.111"}]}]},{"source":"osv","ecosystem":"npm","package":"@anthropic-ai/claude-code","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.0.111"}]}]}],"products":[{"vendor":"anthropic","product":"claude_code"},{"vendor":"anthropics","product":"claude-code"}],"references":[{"url":"https://github.com/anthropics/claude-code/security/advisories/GHSA-vhw5-3g5m-8ggf","tags":["x_refsource_CONFIRM","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24052","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-vhw5-3g5m-8ggf"},{"url":"https://github.com/anthropics/claude-code","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-24052","title":"Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains","description":"Claude Code is an agentic coding tool. Prior to version 1.0.111, Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a startsWith() function to validate trusted domains (e.g., docs.python.org, modelcontextprotocol.io), this could have enabled attackers to register domains like modelcontextprotocol.io.example.com that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. This issue has been patched in version 1.0.111.","status":"published","published":"2026-02-03T20:49:41.997Z","modified":"2026-02-04T20:00:11.786Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:19:50.575061Z"}],"euvd":[{"id":"EUVD-2026-5172","description":"Claude Code is an agentic coding tool. Prior to version 1.0.111, Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a startsWith() function to validate trusted domains (e.g., docs.python.org, modelcontextprotocol.io), this could have enabled attackers to register domains like modelcontextprotocol.io.example.com that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. This issue has been patched in version 1.0.111.","status":"published","published":"2026-02-03T20:49:41Z","modified":"2026-02-04T20:00:11Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T19:48:43.720683Z"}],"ghsa":[{"id":"GHSA-vhw5-3g5m-8ggf","title":"Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains","description":"Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a `startsWith()` function to validate trusted domains (e.g., `docs.python.org`, `modelcontextprotocol.io`), this could have enabled attackers to register domains like `modelcontextprotocol.io.example.com` that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. \n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nThank you to hackerone.com/47sid-praetorian for reporting this issue!","status":"published","published":"2026-02-03T19:15:59Z","modified":"2026-02-03T22:15:32Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:39:22.637668Z"}],"nvd":[{"id":"CVE-2026-24052","description":"Claude Code is an agentic coding tool. Prior to version 1.0.111, Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a startsWith() function to validate trusted domains (e.g., docs.python.org, modelcontextprotocol.io), this could have enabled attackers to register domains like modelcontextprotocol.io.example.com that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. This issue has been patched in version 1.0.111.","status":"published","published":"2026-02-03T21:16:13.073Z","modified":"2026-06-17T10:22:31.613Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:12:05.149641Z"}],"osv":[{"id":"GHSA-vhw5-3g5m-8ggf","title":"Claude Code has a Domain Validation Bypass which Allows Automatic Requests to Attacker-Controlled Domains","description":"Claude Code contained insufficient URL validation in its trusted domain verification mechanism for WebFetch requests. The application used a `startsWith()` function to validate trusted domains (e.g., `docs.python.org`, `modelcontextprotocol.io`), this could have enabled attackers to register domains like `modelcontextprotocol.io.example.com` that would pass validation. This could enable automatic requests to attacker-controlled domains without user consent, potentially leading to data exfiltration. \n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nThank you to hackerone.com/47sid-praetorian for reporting this issue!","status":"published","published":"2026-02-03T19:15:59Z","modified":"2026-02-03T22:34:25.409039Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:57.348035Z"}]}}