VULNERABILITY INTELLIGENCE
CVE-2026-89022
CVSS score7.4 HIGH
EPSS probability0.46%
CISA KEVNot currently listed
Published2026-09-15
Last modified2026-09-16
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Description
BookStack before 26.05.5 contains an authentication bypass vulnerability in its social login implementation that allows unauthenticated attackers to sign in as arbitrary users by authenticating through a different social provider sharing the same driver_id namespace. Attackers can authenticate at one enabled social provider using a user ID that matches an account linked to a different social provider, bypassing credential verification entirely because the SocialAuthService::handleLoginCallback query ignores the driver column when retrieving linked account records.
Weakness classification
- disclosure@vulncheck.com: CWE-290