CVE-2026-89022 BookStack < 26.05.5 Authentication Bypass via Social Login Provider Confusion
Unauthenticated attackers can bypass authentication and sign in as arbitrary users by exploiting social login provider confusion in BookStack.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-89022?
CVE-2026-89022 is a critical authentication bypass vulnerability in bookstackapp bookstack, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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: CWE-290
Which versions are affected by CVE-2026-89022?
How do I fix CVE-2026-89022?
No fix has been published for CVE-2026-89022 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-89022 being exploited?
There is no known exploitation of CVE-2026-89022 in the wild and no public exploit code.
Sources
Also known as GHSA-54r8-f2jx-5qj6.