CVE-2026-20742 Copeland XWEB and XWEB Pro OS Command Injection

High 8.0 Published 27 Feb 2026 Updated 2 Mar 2026

Authenticated attackers can execute arbitrary OS commands on Copeland XWEB controllers via the templates route, requiring vendor patches.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-20742?

CVE-2026-20742 is a high-severity command injection vulnerability in Copeland XWEB 300D PRO, published on 27 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

An OS command injection

vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker to achieve remote code execution on the system by injecting malicious input into requests sent to the templates route.

Weakness: CWE-78

Which versions are affected by CVE-2026-20742?

It affects 3 products.

Products include Copeland Xweb 300d Pro Firmware, Copeland Xweb 500b Pro Firmware, Copeland Xweb 500d Pro Firmware.

How do I fix CVE-2026-20742?

No fix has been published for CVE-2026-20742 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-20742 being exploited?

There is no known exploitation of CVE-2026-20742 in the wild and no public exploit code.

Sources

Also known as GHSA-x4vr-qw7g-2jv2.