Is CVE-2026-89022 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-89022 being exploited in the wild.

How severe is CVE-2026-89022?

High severity, with a CVSS score of 7.4, published 15 September 2026.

Which products and versions are affected?

BookStack BookStack before 26.05.5.

Is there a fix for CVE-2026-89022?

A patch was published on 2026-09-14: Fix released in version 26.05.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-89022 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-89022?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-89022: BookStack social login authentication bypass

CVE-2026-89022 · Severity: high · CVSS 7.4 · Published 2026-09-15

BookStack is a popular open-source documentation and knowledge management platform. A flaw in its social login feature allows attackers to sign in as arbitrary users without valid credentials by authenticating through a different social provider linked to the same account. This could grant unauthorized access to sensitive documents, settings, and user data across all BookStack instances using multiple social login methods.

Quick answers

Is CVE-2026-89022 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-89022 being exploited in the wild.
How severe is CVE-2026-89022?: High severity, with a CVSS score of 7.4, published 15 September 2026.
Which products and versions are affected?: BookStack BookStack before 26.05.5.
Is there a fix for CVE-2026-89022?: A patch was published on 2026-09-14: Fix released in version 26.05.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-89022 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-89022?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

BookStack contains an authentication bypass vulnerability in the SocialAuthService::handleLoginCallback method, where user account lookups by social provider are not properly scoped to the specific authentication driver. An attacker can authenticate at one enabled social provider using a user ID matching an account linked to a different social provider, bypassing all credential verification. The vulnerable query ignores the driver column when retrieving linked social account records, allowing cross-provider account confusion attacks. The vulnerability affects BookStack before version 26.05.5 and is network-accessible without authentication or user interaction required. The fix scopes social account queries to the specific social login system (driver) to prevent mismatched account lookups.

Affected products

BookStack BookStack before 26.05.5

Timeline

2026-09-15: disclosed
2026-09-14: patched: Fix released in version 26.05.5

References

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