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CVE-2026-86121— Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control

Quick assessment

Affected
trycua cua-computer-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cua AI Cua是美国Cua AI公司的一款基于机器学习的人工智能代理平台。 Cua AI Cua 0.3.42之前版本存在授权问题漏洞，该漏洞源于当CONTAINER_NAME环境变量未设置时跳过身份验证并默认绑定所有接口，可能导致未经身份验证的攻击者执行任意命令、读写任意文件及访问交互式PTY shell。

CVSS 9.8 · Critical EPSS 0.59% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
trycua cua-computer-server < 0.3.42 affected
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I. Basic Information for CVE-2026-86121

Vulnerability Information
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Vulnerability Title
Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Cua AI Cua 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cua AI Cua是美国Cua AI公司的一款基于机器学习的人工智能代理平台。 Cua AI Cua 0.3.42之前版本存在授权问题漏洞，该漏洞源于当CONTAINER_NAME环境变量未设置时跳过身份验证并默认绑定所有接口，可能导致未经身份验证的攻击者执行任意命令、读写任意文件及访问交互式PTY shell。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
trycua cua-computer-server 0 ~ 0.3.42 -

II. Public POCs for CVE-2026-86121

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III. Intelligence Information for CVE-2026-86121

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Patches & Fixes for CVE-2026-86121 (1)

Vendor Advisories for CVE-2026-86121 (1)

Proof of Concept for CVE-2026-86121 (2)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-86121

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