CVE-2026-42562: Alextselegidis Plainpad

High severity, CVSS 8.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Alextselegidis Plainpad: before 1.1.1 (fixed in 1.1.1)

Published 2026-05-09. Last modified 2026-07-24.