CVE-2026-110863Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers
Updated under an hour ago ()
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It affects better-auth sso. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.27%, higher than 18% of scored CVEs.
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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
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-287
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.27% (percentile 18)
- Assigned by
- VulnCheck
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
better-auth sso better_auth:sso (from the name) | from 1.7.0-rc.2 before 1.7.3 | CNA record |
References
- https://github.com/better-auth/better-auth/security/advisories/GHSA-mx9r-x6ww-qjw9vendor-advisory
- https://www.vulncheck.com/advisories/better-auth-better-auth-sso-before-1.7.3-authentication-bypass-via-personal-sso-providersthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.