要点
- CVE-2026-42086 是影响 openc3, openc3, cosmos (openc3) 的中危 (CVSS 4.6)漏洞。
- 未来 30 天内被利用的概率（EPSS）：0.20%，高于 9.8% 的漏洞。
- 修复：升级到 7.0.0 或更高版本。
| Package | Affected versions | Patched versions |
|---|
| openc3 PyPI | < 7.0.0
| 7.0.0
|
| openc3 RubyGems | < 7.0.0
| 7.0.0
|
| cosmos | = 7.0.0< 7.0.0
| 7.0.0
|
Description
Summary
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.
Details
The unsafe eval() usage on user-supplied ARRAY parameters happens in convertToValue method in CommandSender.vue
PoC
- Using a drop-down form, choose any command that supports ARRAY parameters,
- Inside square brackets “[…]” place a JavaScript code to be executed
- Send command to CmdTlmServer using dedicated “Send” button
- Observe JavaScript code being executed in the current browser session context
Below example uses INST ARYCMD to execute simple JavaScript code snippet alert(“XSS”).
<img width="947" height="356" alt="image" src="https://github.com/user-attachments/assets/6fbdb6c9-616a-4268-bbb8-a8a1044437ad" />
<img width="942" height="545" alt="image" src="https://github.com/user-attachments/assets/4df24353-aea0-4aa0-adcf-b7c7e387dc83" />
Impact
Local JavaScript execution in the user's browser
NVD 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.
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