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

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Summary

CVECVE-2026-42562
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-09 20:16:28 UTC
Updated2026-05-09 20:16:28 UTC
DescriptionPlainpad 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.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Problem Types: CWE-269 | CWE-269 CWE-269: Improper Privilege Management

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Alextselegidis Plainpad affected < 1.1.1 Not specified

References

ReferenceSourceLinkTags
github.com/alextselegidis/plainpad/commit/9216a876d27b22c3d9259551636d80... [email protected] github.com
github.com/alextselegidis/plainpad/issues/138 [email protected] github.com
github.com/alextselegidis/plainpad/security/advisories/GHSA-pvfv-wvpm-q6f6 [email protected] github.com
github.com/alextselegidis/plainpad/releases/tag/1.1.1 [email protected] github.com
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