CVE-2026-86121
Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 5, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 5, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
cua-computer-servertrycua |
|
References
- GitHub Issue #1892issue-tracking
- Server.auth allow-all when CONTAINER_NAME is unsettechnical-description
- CLI --host default of 0.0.0.0technical-description
- Bind default changed to 127.0.0.1patch
- https://github.com/trycua/cuaproduct
- VulnCheck Advisory: Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Controlthird-party-advisory
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