{"id":"CVE-2025-71404","aliases":["EUVD-2025-210583","GHSA-9x4v-xfq5-m8x5","GHSA-ch2q-47vm-cxgf"],"status":"published","title":"better-auth before 1.1.16 Reflected XSS via error parameter","description":"better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.","severity":{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00719,"percentile":0.54202,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2025-02-05T21:49:39Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"npm","package":"better-auth","fixed_in":["1.1.16"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"better-auth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.0.2"},{"fixed":"1.1.16"}]}]},{"source":"osv","ecosystem":"npm","package":"better-auth","ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.2"},{"fixed":"1.1.16"}]}]}],"products":[{"vendor":"better-auth","product":"better-auth"}],"references":[{"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-9x4v-xfq5-m8x5","tags":["vendor-advisory","advisory","web"]},{"url":"https://github.com/better-auth/better-auth/commit/05ada0b79dbcac93cc04ceb79b23ca598d07830c","tags":["patch","fix"]},{"url":"https://www.vulncheck.com/advisories/better-auth-before-reflected-xss-via-error-parameter","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/better-auth/better-auth/commit/7ae340e2eddad641b7e43d24d37c58a66ce9ddcf","tags":["web"]},{"url":"https://github.com/better-auth/better-auth/blob/05ada0b79dbcac93cc04ceb79b23ca598d07830c/packages/better-auth/src/api/routes/error.ts#L81","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9x4v-xfq5-m8x5"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71404","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-ch2q-47vm-cxgf"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71404.json","tags":["advisory"]},{"url":"https://github.com/better-auth/better-auth","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-71404","title":"better-auth before 1.1.16 Reflected XSS via error parameter","description":"better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.","status":"published","published":"2026-08-01T12:22:17.885Z","modified":"2026-08-03T15:38:00.141Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:42.751171Z"}],"euvd":[{"id":"EUVD-2025-210583","description":"better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.","status":"published","published":"2026-08-01T12:22:17Z","modified":"2026-08-03T15:38:00Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:02:24.366648Z"}],"ghsa":[{"id":"GHSA-9x4v-xfq5-m8x5","title":"Better Auth URL parameter HTML Injection (Reflected Cross-Site scripting)","description":"### Summary\nThe better-auth `/api/auth/error` page was vulnerable to HTML injection, resulting in a reflected cross-site scripting (XSS) vulnerability.\n\n### Details\nThe value of `error` URL parameter was reflected as HTML on the error page: https://github.com/better-auth/better-auth/blob/05ada0b79dbcac93cc04ceb79b23ca598d07830c/packages/better-auth/src/api/routes/error.ts#L81\n\n### Impact\nAn attacker who exploited this vulnerability by coercing a user to visit a specially-crafted URL could execute arbitrary JavaScript in the context of the user's browser.","status":"published","published":"2025-02-05T21:49:39Z","modified":"2025-12-09T16:26:24Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:39:12.222121Z"},{"id":"GHSA-ch2q-47vm-cxgf","title":"better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS...","description":"better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.","status":"published","published":"2026-08-01T15:30:23Z","modified":"2026-08-01T15:30:24Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/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":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:10:01.548476Z"}],"nvd":[{"id":"CVE-2025-71404","description":"better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.","status":"published","published":"2026-08-01T13:16:56.777Z","modified":"2026-10-06T22:10:00.247Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/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":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:03.20248Z"}],"osv":[{"id":"CVE-2025-71404","title":"better-auth before 1.1.16 Reflected XSS via error parameter","description":"better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.","status":"published","published":"2026-08-01T12:22:17.885Z","modified":"2026-10-28T02:30:49.064522401Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:44:53.185592Z"},{"id":"GHSA-9x4v-xfq5-m8x5","title":"Better Auth URL parameter HTML Injection (Reflected Cross-Site scripting)","description":"### Summary\nThe better-auth `/api/auth/error` page was vulnerable to HTML injection, resulting in a reflected cross-site scripting (XSS) vulnerability.\n\n### Details\nThe value of `error` URL parameter was reflected as HTML on the error page: https://github.com/better-auth/better-auth/blob/05ada0b79dbcac93cc04ceb79b23ca598d07830c/packages/better-auth/src/api/routes/error.ts#L81\n\n### Impact\nAn attacker who exploited this vulnerability by coercing a user to visit a specially-crafted URL could execute arbitrary JavaScript in the context of the user's browser.","status":"published","published":"2025-02-05T21:49:39Z","modified":"2026-08-02T03:56:48.551422037Z","cvss":[{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:44.225359Z"}]}}