bookstackapp BookStack up to 26.09.2 Image Controller checkImagePermission improper authorization

Summaryinfo

A vulnerability was found in bookstackapp BookStack up to 26.09.2. It has been declared as critical. This issue affects the function ImageController::checkImagePermission of the component Image Controller. Executing a manipulation can lead to improper authorization. This vulnerability is registered as CVE-2026-125870. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in bookstackapp BookStack up to 26.09.2. This vulnerability affects the function ImageController::checkImagePermission of the component Image Controller. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

BookStack before 26.09.3 contains a missing authorization vulnerability in ImageController::checkImagePermission() that allows authenticated non-admin users to bypass page-level content restrictions for images whose owning page has been moved to the recycle bin, because the permission check relies on Page::getPage() which returns null for soft-deleted pages and silently skips the PageView check. Attackers can enumerate sequential image IDs via GET /images/edit/{id} to disclose metadata of restricted images, and users with image-update-all/image-delete-all privileges can rename, replace, or permanently delete images belonging to content they cannot view, persisting the damage even after the page is restored.

The advisory is available at codeberg.org. This vulnerability was named CVE-2026-125870 since 11/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 26.09.3 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• bookstackapp

Name

• BookStack

Version

• 26.09.0
• 26.09.1
• 26.09.2

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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