---
cve: "CVE-2026-21861"
severity: "CRITICAL"
cvss: 9.1
epss: "2.3%"
vendor: "baserproject"
kev: false
exploited: false
published: "2026-03-31 00:43:58"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-25T12:45:00+02:00"
---

# CVE-2026-21861

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality. An authenticated administrator can execute arbitrary OS commands on the server due to improper handling of user-controlled input that is directly passed to exec() without sufficient validation or escaping. This issue has been patched in version 5.2.3.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 4cab078c93054f55d8fb36990a7ec7550f443932 (Commit)

## Referenzen

- <https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86g>
- <https://basercms.net/security/JVN_20837860>
- <https://github.com/baserproject/basercms/releases/tag/5.2.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-21861) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_