---
cve: "CVE-2026-86121"
severity: "CRITICAL"
cvss: 9.8
epss: "55.8%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-05 10:16:43"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T19:44:08+02:00"
---

# CVE-2026-86121

> 9.8 CRITICAL

## Beschreibung

Cua computer-server versions before 0.3.42 skip authentication when the CONTAINER_NAME environment variable is unset and bind to all interfaces by default, allowing unauthenticated attackers to execute arbitrary commands. Attackers can reach TCP port 8000 to run shell commands via the run_command endpoint, read and write arbitrary files through file operation endpoints, and access interactive PTY shells without authentication.

## CVSS-Vektor

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

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

## Referenzen

- <https://github.com/trycua/cua>
- <https://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/cli.py>
- <https://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/main.py>
- <https://github.com/trycua/cua/commit/59cf25c0ec54>
- <https://github.com/trycua/cua/issues/1892>
- <https://www.vulncheck.com/advisories/cua-computer-server-before-0.3.42-unauthenticated-rce-via-desktop-control>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-86121) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_