{"id":"CVE-2025-71404","state":"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.","publishedAt":"2026-08-01T12:22:17.885Z","updatedAt":"2026-08-03T15:38:00.141Z","severity":{"score":5.1,"label":"Medium","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["better-auth better-auth"],"affected":[{"vendor":"better-auth","product":"better-auth","packageURL":"pkg:npm/better-auth","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.1.16","versionType":"semver"},{"version":"1.1.16","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/better-auth/better-auth/security/advisories/GHSA-9x4v-xfq5-m8x5","https://github.com/better-auth/better-auth/commit/05ada0b79dbcac93cc04ceb79b23ca598d07830c","https://www.vulncheck.com/advisories/better-auth-before-reflected-xss-via-error-parameter"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:10:04.440Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/71xxx/CVE-2025-71404.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-71404","state":"PUBLISHED","datePublished":"2026-08-01T12:22:17.885Z","dateUpdated":"2026-08-03T15:38:00.141Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-07-18T12:38:41.077Z"},"containers":{"cna":{"title":"better-auth before 1.1.16 Reflected XSS via error parameter","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"better-auth","product":"better-auth","packageURL":"pkg:npm/better-auth","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.1.16","versionType":"semver"},{"version":"1.1.16","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-9x4v-xfq5-m8x5","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-9x4v-xfq5-m8x5)"},{"url":"https://github.com/better-auth/better-auth/commit/05ada0b79dbcac93cc04ceb79b23ca598d07830c","tags":["patch"],"name":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/better-auth-before-reflected-xss-via-error-parameter","name":"VulnCheck Advisory: better-auth before 1.1.16 Reflected XSS via error parameter","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-08-01T12:22:17.885Z"},"datePublic":"2025-02-05T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:better-auth:better-auth\\/oauth-provider:*:*:*:*:*:node.js:*:*","versionEndExcluding":"1.1.16"}]}]}],"credits":[{"lang":"en","value":"Eriner","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-03T15:00:29.984329Z","id":"CVE-2025-71404","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-03T15:38:00.141Z"}}]}}}