CVE-2026-89022
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.
How to fix
- bookstackapp bookstack26.05.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bookstackapp bookstack | v < 26.05.5 | 26.05.5 |
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Attack Surface Management
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