CVE-2026-25085 Copeland XWEB and XWEB Pro Unexpected Status Code or Return Value

High 8.6 Published 27 Feb 2026 Updated 2 Mar 2026

Attackers can bypass authentication in Copeland XWEB Pro devices by exploiting improper handling of unexpected return values from the authentication routine.

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

What is CVE-2026-25085?

CVE-2026-25085 is a high-severity authentication bypass vulnerability in Copeland XWEB 300D PRO, published on 27 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, in which an unexpected return value from the authentication routine is later on processed as a legitimate value, resulting in an authentication bypass.

Weakness: CWE-394

Which versions are affected by CVE-2026-25085?

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-2026-25085?

No fix has been published for CVE-2026-25085 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-25085 being exploited?

There is no known exploitation of CVE-2026-25085 in the wild and no public exploit code.

Sources

Also known as GHSA-mprq-mg66-vm32.