CVE-2026-110863

HighCVSS 8.1/10Last modified Oct 16, 2026

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 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-287

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
better-authsso>= 1.7.0-rc.2, < 1.7.3

References

Timeline

Published
Oct 14, 2026
Last modified
Oct 16, 2026
NVD status
Awaiting Analysis

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