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

Quick assessment

Affected
alextselegidis plainpad
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Plainpad是Alex Tselegidis个人开发者的一款自托管的笔记应用。 Plainpad 1.1.1之前版本存在安全漏洞，该漏洞源于允许低权限用户通过PUT请求中的admin参数自提升为管理员，可能导致权限提升。

CVSS 8.3 · High EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
alextselegidis plainpad < 1.1.1 affected
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I. Basic Information for CVE-2026-42562

Vulnerability Information
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Vulnerability Title
Plainpad: Privilege Escalation via Writable Admin Field in Profile Update (Access Control)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Plainpad 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Plainpad是Alex Tselegidis个人开发者的一款自托管的笔记应用。 Plainpad 1.1.1之前版本存在安全漏洞，该漏洞源于允许低权限用户通过PUT请求中的admin参数自提升为管理员，可能导致权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
alextselegidis plainpad < 1.1.1 -

II. Public POCs for CVE-2026-42562

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12927 chars
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-42562

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Patches & Fixes for CVE-2026-42562 (2)

Vendor Advisories for CVE-2026-42562 (1)

Vendor Pages for CVE-2026-42562 (1)

IV. Related Vulnerabilities

Same product: plainpad
Same vendor: alextselegidis
Same weakness: CWE-269

V. Comments for CVE-2026-42562

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