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VULNERABILITIES

CVE-2026-110863 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/better-auth/better-auth/security/advisories/GHSA-mx9r-x6ww-qjw9 [email protected]
https://www.vulncheck.com/advisories/better-auth-better-auth-sso-before-1.7.3-authentication-bypass-via-personal-sso-providers [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-287Improper Authentication[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-110863
NVD Published Date:
Oct 14, 2026
NVD Last Modified:
Oct 16, 2026
Source:
[email protected]
CVE-2026-110863 Details - Not Deferred