Vulnerability · Published May 9, 2026 · Assigned by GitHub_M

CVE-2026-42562Plainpad: Privilege Escalation via Writable Admin Field in Profile Update (Access Control)

High 8.3

In plain English

A high-severity privilege mismanagement in plainpad from alextselegidis. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.3%top 82.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
alextselegidis	plainpad	< 1.1.1

Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

References

https://github.com/alextselegidis/plainpad/security/advisories/GHSA-pvfv-wvpm-q6f6 x_refsource_CONFIRM
https://github.com/alextselegidis/plainpad/issues/138 x_refsource_MISC
https://github.com/alextselegidis/plainpad/commit/9216a876d27b22c3d9259551636d803f7cb075fc x_refsource_MISC
https://github.com/alextselegidis/plainpad/releases/tag/1.1.1 x_refsource_MISC