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.
Metrics
Affected Vendors & Products
Advisories
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Fixes
Solution
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Workaround
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References
History
Wed, 14 Oct 2026 23:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers | |
| First Time appeared |
Better-auth
Better-auth better-auth\/sso |
|
| Weaknesses | CWE-287 | |
| CPEs | cpe:2.3:a:better-auth:better-auth\/sso:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Better-auth
Better-auth better-auth\/sso |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-14T22:52:50.378Z
Reserved: 2026-10-14T22:18:33.239Z
Link: CVE-2026-110863
No data.
Status : Received
Published: 2026-10-14T23:17:27.830
Modified: 2026-10-14T23:17:27.830
Link: CVE-2026-110863
No data.
OpenCVE Enrichment
No data.
Weaknesses