---
cve: "CVE-2026-42562"
severity: "HIGH"
cvss: 8.3
epss: "26%"
vendor: "alextselegidis"
kev: false
exploited: false
published: "2026-05-09 20:16:28"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T21:35:44+02:00"
---

# CVE-2026-42562

> 8.3 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 9216a876d27b22c3d9259551636d803f7cb075fc (Commit)
- ab27ad80801fdc8a84a65251eb19fa15c529fe97 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42562) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_