Quick answers
- Is CVE-2026-125870 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-125870 being exploited in the wild.
- How severe is CVE-2026-125870?
- Medium severity, with a CVSS score of 4.2, published 12 November 2026.
- Which products and versions are affected?
- BookStack before 26.09.3.
- Is there a fix for CVE-2026-125870?
- Yes: fixed in BookStack 26.09.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-125870 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-125870?
- 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 26.09.3
Technical details
The vulnerability exists in ImageController::checkImagePermission() which fails to validate access when the owning page is soft-deleted (moved to recycle bin), as Page::getPage() returns null and skips the PageView authorization check. Authenticated attackers can enumerate sequential image IDs via GET /images/edit/{id} to disclose restricted image metadata, and users with elevated permissions can rename, replace, or delete images from inaccessible content, with damage persisting even after page restoration.
Affected products
- BookStack BookStack before 26.09.3
Timeline
- 2026-11-12: disclosed