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CVE-2026-42086— OpenC3 COSMOS: Self-XSS in the Command Sender

Quick assessment

Affected
OpenC3 cosmos
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.

OpenC3 COSMOS是OpenC3开源的一个应用程序。 OpenC3 COSMOS 7.0.0之前版本存在跨站脚本漏洞，该漏洞源于Command Sender UI对数组类命令参数使用不安全的eval函数，可能导致用户提供的有效载荷在浏览器中执行，造成自跨站脚本攻击，攻击者可读取或修改认证浏览器上下文中的数据。

CVSS 4.6 · Medium EPSS 0.29% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenC3 cosmos < 7.0.0 affected
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I. Basic Information for CVE-2026-42086

Vulnerability Information
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Vulnerability Title
OpenC3 COSMOS: Self-XSS in the Command Sender
Source: CVE Program / CVE List V5
Vulnerability Description
OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to version 7.0.0, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which allows a user-supplied payload to execute in the browser when sending a command. This creates a self-XSS risk because an attacker can trigger their own script execution in the victim’s session, if allowed to influence the array parameter input, for example via phishing. If successful, an attacker may read or modify data in the authenticated browser context, including session tokens in local storage. This issue has been patched in version 7.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenC3 COSMOS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenC3 COSMOS是OpenC3开源的一个应用程序。 OpenC3 COSMOS 7.0.0之前版本存在跨站脚本漏洞，该漏洞源于Command Sender UI对数组类命令参数使用不安全的eval函数，可能导致用户提供的有效载荷在浏览器中执行，造成自跨站脚本攻击，攻击者可读取或修改认证浏览器上下文中的数据。
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
OpenC3 cosmos < 7.0.0 -

II. Public POCs for CVE-2026-42086

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III. Intelligence Information for CVE-2026-42086

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Vendor Advisories for CVE-2026-42086 (1)

Same Patch Batch · OpenC3 · 2026-05-04 · 5 CVEs total

CVE-2026-42087 9.6 CRITICAL OpenC3 COSMOS: SQL Injection in QuestDB Time-Series Data Base
CVE-2026-42088 9.6 CRITICAL OpenC3 COSMOS: Administrative Actions via the Script Runner Tool
CVE-2026-42084 8.1 HIGH OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence
CVE-2026-42085 4.3 MEDIUM OpenC3 COSMOS: Arbitrary write to plugins directory via path-traversed config filenames

IV. Related Vulnerabilities

Same product: cosmos
Same vendor: OpenC3
Same weakness: CWE-79

V. Comments for CVE-2026-42086

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