CVE-2026-116020
CVE-2026-116020 · BookStack before 26.09.2 Incorrect Authorization via AttachmentController on Draft Pages
This page contains facts from public vulnerability sources. Check the original advisory before updating.
BookStack before 26.09.2 contains an incorrect authorization vulnerability in AttachmentController that allows authenticated users to access other users' draft page attachments by ID. Attackers with attachment permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.
CVSS 5.3 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Affected products and versions
bookstack
- Versions
- ≥ 0, < 26.09.2: Affected (custom)
Update to 26.09.2
Original sources
- https://codeberg.org/bookstack/bookstack/commit/fcadecccda706b4ecaf9ac3f8e27defe0ebe78ae
- https://www.bookstackapp.com/blog/bookstack-release-v26-09-2/
- https://codeberg.org/bookstack/bookstack/releases/tag/v26.09.2
- https://codeberg.org/bookstack/bookstack/src/tag/v26.09.1/app/Uploads/Controllers/AttachmentController.php
- https://www.vulncheck.com/advisories/bookstack-before-26.09.2-incorrect-authorization-via-attachmentcontroller-on-draft-pages
- https://nvd.nist.gov/vuln/detail/CVE-2026-116020