CVE-2026-110863
CVE-2026-110863 · Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.6 · High · EPSS 0.3% · Fix available
- Published
- Updated
Affected products and versions
sso
- Versions
- ≥ 1.7.0-rc.2, < 1.7.3: Affected (semver)
Update to 1.7.3