CVE-2026-86285
BookStack Attachment Edit Endpoint AttachmentController.php getUpdateForm access control
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-284 CWE-266 |
| Vendor | n/a |
| Product | bookstack |
| Published | Sep 7, 2026 |
| Last Updated | Sep 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
n/a / BookStack
26.05.0 26.05.1 26.05.2
References
vuldb.com: https://vuldb.com/vuln/399445 vuldb.com: https://vuldb.com/vuln/399445/cti vuldb.com: https://vuldb.com/cve/CVE-2026-86285 vuldb.com: https://vuldb.com/submit/905693 ashutosh-jena.in: https://ashutosh-jena.in/blog/broken-access-control-in-bookstack-how-a-missing-permission-check-leaked-attachment-data codeberg.org: https://codeberg.org/bookstack/bookstack/commit/4e406c41c4c8060a5795e74c66fb96362e54f400
Credits
🔍 MAVERICK-VF142 (VulDB User)