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CVE-2026-42562

Plainpad: Privilege Escalation via Writable Admin Field in Profile Update (Access Control)

Published: May 9, 2026Updated: May 13, 2026 Sources: CVE List NVDCWE-269
NVD MITRE
8.3CVSSHIGH
EPSS Score
0.3%
Top 82.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-269

Affected Products

plainpadalextselegidis
On-prem
Web & CMS Plugins / wordpress-plugin
alextselegidisindividual-devWeb & CMS Pluginsaka alextselegidis/easyappointments, easy!appointments

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/alextselegidis/plainpad/security/advisories/GHSA-pvfv-wvpm-q6f6
github.com
https://github.com/alextselegidis/plainpad/issues/138
github.com
https://github.com/alextselegidis/plainpad/commit/9216a876d27b22c3d9259551636d803f7cb075fc
github.com
and 1 more references View all →

Timeline

Published
May 9, 2026
Last Updated
May 13, 2026

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