CVE-2026-89022
Received Received - Intake

Authentication Bypass in BookStack via Social Login

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

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.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-89022
EUVD
EUVD-2026-78821

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
bookstack bookstack to 26.05.5 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-290 This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

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Executive Summary

BookStack before version 26.05.5 has an authentication bypass flaw in its social login system. Attackers can exploit this by signing in through a different social provider that shares the same driver_id namespace, allowing them to impersonate any user without proper authentication. The vulnerability exists because the system ignores the driver column when retrieving linked account records during login.

Impact Analysis

This vulnerability allows unauthenticated attackers to gain unauthorized access to user accounts, potentially leading to data theft, account takeover, or unauthorized actions within the BookStack application. Users with linked social accounts are particularly at risk if the application is vulnerable.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements under GDPR and HIPAA. Organizations using vulnerable BookStack versions may face compliance violations, data breach notifications, and potential fines due to inadequate access controls.

Mitigation Strategies

Upgrade BookStack to version 26.05.5 or later to address the authentication bypass vulnerability in the social login implementation.

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