by Kastro
Paper/Archive/CVE-2026-86121

CVE-2026-86121

trycua cua-computer-server — Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control

EPSS 1%public exploitCVSS 9.8
critical.is priorityof 100
53
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 66.1.661 × 2013.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
cua-computer-server< 0.3.420.3.42CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/trycua/cua/issues/1892writeupgithub.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/main.pywriteupgithub.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/cli.pypatchgithub.com/trycua/cua/commit/59cf25c0ec54refgithub.com/trycua/cuawriteupvulncheck.com/advisories/cua-computer-server-before-0.3.42-unauthenticated-rce-via-desktop-control