CVE-2026-42086
OpenC3 COSMOS is Vulnerable to Self-XSS Through the Command Sender
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](https://github.com/OpenC3/cosmos/blob/main/openc3-cosmos-init/plugins/packages/openc3-cosmos-tool-cmdsender/src/tools/CommandSender/CommandSender.vue) ### PoC 1. Using a drop-down form, choose any command that supports ARRAY parameters, 2. Inside square brackets “[…]” place a JavaScript code to be executed 3. Send command to CmdTlmServer using dedicated “Send” button 4. 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
How to fix CVE-2026-42086
To remediate CVE-2026-42086, upgrade the affected package to a fixed version below.
- —upgrade to 7.0.0 or later
- —upgrade to 7.0.0 or later
- —upgrade to 7.0.0 or later
Is CVE-2026-42086 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.