CVE Explorer
CVE-2025-71402
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth","product":"better-auth","vendor":"better-auth","versions":[{"lessThan":"1.4.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"1.4.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3d6b5370aaa6072f16ffe1e8e133e4dc99dc3e50fec872d9c82fb5ae9e59e817 · sha256:d604ecdb21b4c3eb… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2,"baseSeverity":"LOW","privilegesRequired":"HIGH","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3d6b5370aaa6072f16ffe1e8e133e4dc99dc3e50fec872d9c82fb5ae9e59e817 · sha256:d604ecdb21b4c3eb… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-347","description":"Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3d6b5370aaa6072f16ffe1e8e133e4dc99dc3e50fec872d9c82fb5ae9e59e817 · sha256:d604ecdb21b4c3eb… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"GitHub Security Advisory (GHSA-wmjr-v86c-m9jj)","tags":["vendor-advisory"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-wmjr-v86c-m9jj"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d6b5370aaa6072f16ffe1e8e133e4dc99dc3e50fec872d9c82fb5ae9e59e817 · sha256:d604ecdb21b4c3eb… · /containers/cna/references/0
{"name":"VulnCheck Advisory: better-auth before 1.4.0 Session Revocation via Forged Cookie","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/better-auth-before-session-revocation-via-forged-cookie"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d6b5370aaa6072f16ffe1e8e133e4dc99dc3e50fec872d9c82fb5ae9e59e817 · sha256:d604ecdb21b4c3eb… · /containers/cna/references/1
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.