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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://ashutosh-jena.in/blog/broken-access-control-in-bookstack-how-a-missing-…
cna@vuldb.com
https://codeberg.org/bookstack/bookstack/commit/4e406c41c4c8060a5795e74c66fb963…
cna@vuldb.com
https://vuldb.com/cve/CVE-2026-86285
cna@vuldb.com
https://vuldb.com/submit/905693
cna@vuldb.com
https://vuldb.com/vuln/399445
cna@vuldb.com
https://vuldb.com/vuln/399445/cti
cna@vuldb.com