high8.1
CVE-2026-110863
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 u…
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Better Auth @Better-Auth/Sso From 1.7.0-Rc.2 | before 1.7.3 |
Versions were read from the advisory text. No structured product data has been published for this record yet.