Description
A vulnerability was detected in BookStack up to 26.05.2. Affected by this issue is the function AttachmentController::getUpdateForm of the file app/Uploads/Controllers/AttachmentController.php of the component Attachment Edit Endpoint. The manipulation of the argument ID results in improper access controls. The attack may be launched remotely. The exploit is now public and may be used. The patch is identified as 4e406c41c4c8060a5795e74c66fb96362e54f400. It is advisable to implement a patch to correct this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | BookStack | 26.05.0, 26.05.1, 26.05.2 | — |
References
- VDB-399445 | BookStack Attachment Edit Endpoint AttachmentController.php getUpdateForm access control vdb-entry technical-description
- VDB-399445 | CTI Indicators (IOB, IOC, TTP, IOA) signature permissions-required
- CVE-2026-86285 | CVE Analysis and Report third-party-advisory
- Submit #905693 | BookStack 26.05.2 Missing authorization / Broken Access Control third-party-advisory
- https://ashutosh-jena.in/blog/broken-access-control-in-bookstack-how-a-missing-permission-check-leaked-attachment-data exploit
- https://codeberg.org/bookstack/bookstack/commit/4e406c41c4c8060a5795e74c66fb96362e54f400 patch