CVE-2026-86121 Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control
Unauthenticated attackers can execute arbitrary commands and access files on Cua computer-server when the CONTAINER_NAME environment variable is unset.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86121?
CVE-2026-86121 is a critical authentication bypass vulnerability in trycua cua-computer-server, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-306
Which versions are affected by CVE-2026-86121?
How do I fix CVE-2026-86121?
No fix has been published for CVE-2026-86121 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-86121 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86121 exists.
Sources
Also known as GHSA-pccw-h89v-h9cj.