Quick answers
- Is CVE-2026-116020 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-116020 being exploited in the wild.
- How severe is CVE-2026-116020?
- Medium severity, with a CVSS score of 5.4, published 24 October 2026.
- Which products and versions are affected?
- BookStack before 26.09.2.
- Is there a fix for CVE-2026-116020?
- Yes: fixed in BookStack 26.09.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-116020 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-116020?
- Check whether you run BookStack at an affected version. 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.
How to fix
- Fixed in: BookStack 26.09.2
Technical details
BookStack versions before 26.09.2 fail to properly authorize attachment access in AttachmentController, allowing authenticated users to access other users' draft page attachments through ID enumeration. The vulnerability requires authentication and attachment permissions but enables unauthorized access to unpublished content. The issue is fixed in version 26.09.2.
Affected products
- BookStack BookStack before 26.09.2
Timeline
- 2026-10-24: disclosed