Is CVE-2026-42086 actively exploited?

No active exploitation of CVE-2026-42086 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42086 be exploited remotely?

Yes. CVE-2026-42086 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42086?

CVE-2026-42086 has a CVSS score of 4.6 (MEDIUM).

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MEDIUM

CVE-2026-42086

CWE-79Published: May 4, 2026· Updated: May 8, 2026

4.6

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42086 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.