CVE-2026-89022: Authentication Bypass by Spoofing in bookstackapp bookstack
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.
CVE-2026-89022: Authentication Bypass by Spoofing in bookstackapp bookstack
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.
CVSS v4.0
Score 9.1critical
Affected software
bookstackapp
bookstack
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Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-10T16:23:54.471Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa96f8255bf5e2cf510d8b3
Added to database: 09/15/2026, 16:17:06 UTC
Last updated: 09/15/2026, 16:17:06 UTC
Views: 1
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