CVE-2026-110863
Better Auth @better-auth/sso from 1.7.0-rc.2 before 1.7.3 contains an authentication bypass…
- Risk score
- 52/100
- CVSS
- 8.1 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 14 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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, b…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.7.3 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.1 high
References
Original description
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.
Last activity 14 Oct 2026. Patch Forecast updates every hour.