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CVE-2026-110863

8.6 high SSVC exploitation: none Awaiting Analysis
NVD · CVE.org

Better Auth @better-auth/sso from 1.7.0-rc.2 before 1.7.3 contains an authentication bypass vulnerability that allows authenticated users to sign in as other users by registering a personal SSO provider. Attackers can copy a legitimate provider's OIDC issuer or SAML entity ID and assert a victim's subject or NameID, because account lookup ignores providerId, creating sessions for victim accounts.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusReceived → Awaiting AnalysisNVD modified 2026-10-15 20:33
  2. First seenCVSS 8.6NVD modified 2026-10-14 23:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 2