alextselegidis plainpad up to 1.1.0 API Endpoint /api.php/v1/users/ privileges management

Summaryinfo

A vulnerability, which was classified as critical, has been found in alextselegidis plainpad up to 1.1.0. Affected by this vulnerability is an unknown functionality of the file /api.php/v1/users/ of the component API Endpoint. This manipulation causes privileges management. This vulnerability is handled as CVE-2026-42562. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in alextselegidis plainpad up to 1.1.0 and classified as critical. Affected by this vulnerability is an unknown functionality of the file /api.php/v1/users/ of the component API Endpoint. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Plainpad is a self hosted note taking app. Prior to version 1.1.1, Plainpad allows a low-privilege authenticated user to self-escalate to administrator by submitting admin=true in PUT /api.php/v1/users/{id}. The endpoint directly persists the admin attribute from user input, and the escalated account can immediately access admin-only routes. This issue has been patched in version 1.1.1.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-42562 since 04/28/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 1.1.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 9216a876d27b22c3d9259551636d803f7cb075fc is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• alextselegidis

Name

• plainpad

Version

• 1.0
• 1.1.0

License

• open-source

Website

• Product: https://github.com/alextselegidis/plainpad/

CPE 2.3info

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• 🔒

CPE 2.2info

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