CVE-2026-86121
Medium
Elevated severity or exploit probability.
CVSS base
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.1%
64.6th percentile
CISA KEV
Not listed
Weakness / dates
CWE-306
Published 2026-09-05 · modified 2026-09-08
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.
References
- 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
- https://github.com/trycua/cua/issues/1892