{"id":"CVE-2025-71402","revision":"23e543ebb8124f02bc0d99989b1b75df","records":[{"revision":"23e543ebb8124f02bc0d99989b1b75df","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-71402","aliases":[],"title":"better-auth before 1.4.0 Session Revocation via Forged Cookie","description":"better-auth versions greater than 1.3.34 and before 1.4.0 contain a vulnerability in the multi-session plugin's /sign-out after-hook, which trusts raw multi-session cookies and forwards extracted values to internalAdapter.deleteSessions without verifying the cookie signature (e.g., via getSignedCookie). An attacker can supply a forged _multi-* cookie to trigger deletion of arbitrary session tokens.","state":0,"publishedAt":"2026-08-01T12:22:16.655+00:00","modifiedAt":"2026-08-03T19:32:01.754+00:00","affected":[{"ecosystem":"Vendor product","name":"better-auth","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"better-auth\",\n                    \"product\": \"better-auth\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/better-auth\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"1.4.0\"\n                        },\n                        {\n                            \"version\": \"1.4.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N","score":2,"severity":"LOW"}],"references":["https://github.com/better-auth/better-auth/security/advisories/GHSA-wmjr-v86c-m9jj","https://www.vulncheck.com/advisories/better-auth-before-session-revocation-via-forged-cookie"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71402","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-71402","identifiers":["CVE-2025-71402"]},"retained":false,"historicalAffected":[]}],"coverage":[]}