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CRITICAL

CVE-2026-86121

Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control

CVSS v3

9.8

CRITICAL

EPSS Score

1.1 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

Published
2026-09-05
Last Modified
2026-09-05

Frequently asked questions

What is CVE-2026-86121?

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.

Is CVE-2026-86121 actively exploited?

Active exploitation of CVE-2026-86121 has not been confirmed. Its EPSS score was 1.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-86121?

CVE-2026-86121 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2026-86121 affecting your environment?

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