Vulnerability Description
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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://codeberg.org/bookstack/bookstack/commit/fcadecccda706b4ecaf9ac3f8e27defe
- https://codeberg.org/bookstack/bookstack/releases/tag/v26.09.2
- https://codeberg.org/bookstack/bookstack/src/tag/v26.09.1/app/Uploads/Controller
- https://www.bookstackapp.com/blog/bookstack-release-v26-09-2/
- https://www.vulncheck.com/advisories/bookstack-before-26.09.2-incorrect-authoriz
FAQ
What is CVE-2026-116020?
CVE-2026-116020 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 a...
How severe is CVE-2026-116020?
CVE-2026-116020 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-116020?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.