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Vulnerability record · CVE-2026-86121 · published 5 September 2026

CVE-2026-86121: Missing authentication for critical function vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 1.1% · top 35.3% CWE-306 · Missing authentication for critical function Deferred
9.3CVSS 4.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
24 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-86121), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.