{"cve":"CVE-2025-71402","nvd":{"published":"2026-08-01T13:16:55.510","modified":"2026-10-06T22:10:00.247","status":"Deferred","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.","cvss_v4":{"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":2.0},"cvss_v3":null,"cwes":["CWE-347"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2025-71402","score":0.00268,"percentile":0.18735,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wmjr-v86c-m9jj","url":"https://osv.dev/vulnerability/GHSA-wmjr-v86c-m9jj","summary":"Better Auth's multi-session sign-out hook allows forged cookies to revoke arbitrary sessions","modified":"2026-08-02T03:56:46.379093639Z","packages":[{"ecosystem":"npm","name":"better-auth","purl":"pkg:npm/better-auth","ranges":[">=1.3.34 <1.4.0"],"fixed":["1.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}