Vulnerability in BookStackApp BookStack

[ Description ]Official 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permissions can enumerate sequential attachment IDs to download, rename, relink, or replace files on another user's unpublished draft pages.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• codeberg.org/bookstack/bookstack/commit/fcadecccda706b4ecaf9ac3f8e27defe0ebe78ae
• codeberg.org/bookstack/bookstack/releases/tag/v26.09.2
• codeberg.org/bookstack/bookstack/src/tag/v26.09.1/app/Uploads/Controllers/AttachmentCon…
• www.bookstackapp.com/blog/bookstack-release-v26-09-2
• www.vulncheck.com/advisories/bookstack-before-26.09.2-incorrect-authorization-via-attac…