{"id":"CVE-2025-71402","summary":"better-auth before 1.4.0 Session Revocation via Forged Cookie","details":"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.","aliases":["GHSA-wmjr-v86c-m9jj"],"modified":"2026-08-04T11:48:40.993724742Z","published":"2026-08-01T12:22:16.655Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-347"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71402.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71402.json"},{"type":"ADVISORY","url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-wmjr-v86c-m9jj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71402"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/better-auth-before-session-revocation-via-forged-cookie"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/better-auth/better-auth","events":[{"introduced":"0"},{"fixed":"bff00f6b7fb3d95363888186cd610ea3e4e0f174"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.4.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.4.0-beta.27","v1.4.0-beta.26","v1.4.0-beta.25","v1.4.0-beta.24","v1.4.0-beta.23","v1.4.0-beta.22","v1.4.0-beta.21","v1.4.0-beta.20","v1.4.0-beta.19","v1.4.0-beta.18","v1.4.0-beta.17","v1.4.0-beta.16","v1.4.0-beta.15","v1.4.0-beta.14","v1.4.0-beta.13","v1.4.0-beta.12","v1.4.0-beta.11","v1.4.0-beta.10","v1.4.0-beta.9","v1.4.0-beta.8","v1.4.0-beta.7","v1.4.0-beta.6","v1.4.0-beta.5","v1.4.0-beta.4","v1.4.0-beta.3","v1.4.0-beta.2","v1.4.0-beta.1","v1.3.11","v1.3.10","v1.3.9","v1.3.8","v1.3.8-beta.1","v1.3.7-beta.3","v1.3.7-beta.2","v1.3.6","v1.3.5-beta.7","v1.3.5-beta.6","v1.3.5-beta.5","v1.3.5-beta.4","v1.3.5-beta.3","v1.3.5-beta.2","v1.3.5-beta.1","better-auth@1.3.4","@better-auth/stripe@1.3.4","@better-auth/sso@1.3.4","@better-auth/expo@1.3.4","@better-auth/cli@1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.1-beta.1","v1.3.0","v1.3.0-beta.11","v1.3.0-beta.10","v1.2.12","v1.2.11","v1.2.10","v1.2.10-beta.1","v1.2.9","v1.2.9-beta.10","v1.2.9-beta.9","feat/2867-oidcprovider-trusted","v1.2.9-beta.8","v1.2.9-beta.7","v1.2.9-beta.6","v1.2.9-beta.5","v1.2.8","v1.2.8-beta.8","v1.2.8-beta.7","v1.2.8-beta.6","v1.2.8-beta.4","v1.2.8-beta.3","v1.2.8-beta.2","v1.2.8-beta.1","v1.2.7","v1.2.7-beta.1","v1.2.6","v1.2.6-beta.13","v1.2.6-beta.12","v1.2.6-beta.11","v1.2.6-beta.10","v1.2.6-beta.9","v1.2.6-beta.8","v1.2.6-beta.7","v1.2.6-beta.6","v1.2.6-beta.5","v1.2.6-beta.4","v1.2.6-beta.3","v1.2.6-beta.2","v1.2.6-beta.1","v1.2.5","v1.2.5-beta.10","v1.2.5-beta.9","v1.2.5-beta.8","v1.2.5-beta.7","v1.2.5-beta.6","v1.2.5-beta.5","v1.2.5-beta.4","v1.2.5-beta.3","v1.2.5-beta.2","v1.2.5-beta.1","v1.2.4","v1.2.4-beta.12","v1.2.4-beta.10","v1.2.4-beta.9","v1.2.4-beta.8","v1.2.4-beta.7","v1.2.4-beta.6","v1.2.4-beta.5","v1.2.4-beta.4","v1.2.4-beta.3","v1.2.4-beta.2","v1.2.4-beta.1","v1.2.3","v1.2.3-beta.3","v1.2.3-beta.2","v1.2.3-beta.1","v1.2.2","v1.2.2-beta.6","v1.2.2-beta.5","v1.2.2-beta.4","v1.2.2-beta.3","v1.2.2-beta.2","v1.2.2-beta.1","v1.2.1","v1.2.1-beta.8","v1.2.1-beta.7","v1.2.1-beta.6","v1.2.1-beta.5","v1.2.1-beta.4","v1.2.1-beta.3","v1.2.1-beta.2","v1.2.1-beta.1","v1.2.0","v1.2.0-beta.19","v1.2.0-beta.18","v1.2.0-beta.17","v1.2.0-beta.16","v1.2.0-beta.15","v1.2.0-beta.14","v1.2.0-beta.13","v1.2.0-beta.12","v1.2.0-beta.11","v1.2.0-beta.10","v1.2.0-beta.9","v1.2.0-beta.8","v1.2.0-beta.7","v1.2.0-beta.6","v1.2.0-beta.5","v1.2.0-beta.4","v1.2.0-beta.3","v1.2.0-beta.2","v1.1.15-beta.6","v1.1.15-beta.5","v1.1.15-beta.4","v1.1.15-beta.3","v1.1.15-beta.2","v1.1.15-beta.1","v1.1.14","v1.1.14-beta.6","v1.1.14-beta.5","v1.1.14-beta.4","v1.1.14-beta.3","v1.1.14-beta.2","v1.1.14-beta.1","v1.1.13","v1.1.13-beta.3","v1.1.13-beta.2","v1.1.13-beta.1","v1.1.12","v1.1.12-beta.4","v1.1.12-beta.3","v1.1.12-beta.2","v1.1.11","v1.1.11-beta.1","v1.1.10","v1.1.10-beta.2","v1.1.10-beta.1","v1.1.9","v1.1.9-beta.1","v1.1.8","v1.1.8-beta.3","v1.1.8-beta.2","v1.1.8-beta.1","v1.1.7","v1.1.6","v1.1.5","v1.1.4","v1.1.4-beta.2","v1.1.4-beta.1","v1.1.3","v1.1.3-beta.6","v1.1.2","v1.1.2-beta.4","v1.1.2-beta.3","v1.1.2-beta.2","v1.1.2-beta.1","v1.1.1","v1.1.0","v1.0.23-beta.6","v1.0.23-beta.2","v1.0.22","v1.0.22-beta.4","v1.0.22-beta.3","v1.0.22-beta.2","v1.0.22-beta.1","v1.0.21","v1.0.20","v1.0.19","v1.0.18","v1.0.17","v1.0.16","v1.0.16-beta.2","v1.0.16-beta.1","v1.0.15","v1.0.14","v1.0.13","v1.0.12","v1.0.12-beta.3","v1.0.12-beta.2","v1.0.12-beta.1","v1.0.11","v1.0.11-beta.8","v1.0.11-beta.7","v1.0.11-beta.6","v1.0.11-beta.5","v1.0.11-beta.4","v1.0.11-beta.2","v1.0.10","v1.0.10-beta.3","v1.0.10-beta.2","v1.0.10-beta.1","v1.0.9","v1.0.9-beta.7","v1.0.9-beta.6","v1.0.9-beta.5","v1.0.9-beta.3","v1.0.9-beta.1","v1.0.8","v1.0.8-beta.4","v1.0.8-beta.2","v1.0.8-beta.1","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v0.8.9-beta.2","v0.8.8","v0.8.8-beta.2","v0.8.8-beta.1","v0.8.7-beta.5","v0.8.7-beta.3","v0.8.7-beta.2","v0.8.7-beta.1","v0.8.6-beta.6","v0.8.6-beta.3","v0.8.6-beta.2","v0.8.6-beta.1","v0.8.5","v0.8.5-beta.3","v0.8.5-beta.2","v0.8.5-beta.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