CVE-2026-3204 Cross-site scripting in Server

Critical 9.8 Published 3 Mar 2026 Updated 4 Mar 2026

Remote attackers can spoof displayed error messages in Devolutions Server via crafted URLs, potentially misleading users.

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-2026-3204?

CVE-2026-3204 is a critical cross-site scripting vulnerability in Devolutions Devolutions Server, published on 3 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Improper input validation in the error message page in Devolutions Server 2025.3.16 and earlier allows remote attackers to spoof the displayed error message via a specially crafted URL.

Weakness: CWE-20

Which versions are affected by CVE-2026-3204?

It affects 1 product.

Products include Devolutions Devolutions Server.

How do I fix CVE-2026-3204?

No fix has been published for CVE-2026-3204 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-3204 being exploited?

There is no known exploitation of CVE-2026-3204 in the wild and no public exploit code.

All Devolutions Devolutions Server vulnerabilities

Sources

Also known as GHSA-jq3r-jmv6-j5m4.