What is CVE-2026-3204?

CVE-2026-3204 is a critical-severity vulnerability in Devolutions Devolutions_server, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2026-03-03.

How severe is CVE-2026-3204?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Devolutions Devolutions_server

CVE-2026-3204

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.005 (41.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Devolutions Devolutions_server
Devolutions Server — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security@devolutions.net (Vendor Advisory)

Frequently asked questions

What is CVE-2026-3204?: CVE-2026-3204 is a critical-severity vulnerability in Devolutions Devolutions_server, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2026-03-03.
How severe is CVE-2026-3204?: Critical severity. CVSS v3 base score is 9.8 out of 10.