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Vulnerability record · CVE-2026-3204 · published 3 March 2026

CVE-2026-3204: Devolutions server improper input validation vulnerability

Devolutions · Devolutions Server

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.

9.8 CVSS 3.1 Critical EPSS 0.62% · top 52.3% CWE-20 · Improper input validation
9.8CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://devolutions.net/security/advisories/DEVO-2026-0005 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-3130Devolutions server vulnerabilityImproper Enforcement of Behavioral Controls in Devolutions Server 2025.3.15 and earlier allows an authenticated attacker with the delete permission t…EPSS 0.52%9.8CVE-2026-3224Devolutions server improper authentication vulnerabilityAuthentication bypass in the Microsoft Entra ID (Azure AD) authentication mode in Devolutions Server 2025.3.15.0 and earlier allows an unauthenticate…EPSS 0.63%9.8CVE-2026-0610Devolutions server sql injection vulnerabilitySQL Injection vulnerability in remote-sessions in Devolutions Server.This issue affects Devolutions Server 2025.3.1 through 2025.3.12EPSS 0.30%9.8CVE-2024-2921Devolutions server missing authentication for critical function vulnerabilityImproper access control in PAM vault permissions in Devolutions Server 2024.1.10.0 and earlier allows an authenticated user with access to the PAM to…EPSS 0.79%9.5CVE-2025-6523Devolutions server vulnerabilityUse of weak credentials in emergency authentication component in Devolutions Server allows an unauthenticated attacker to bypass authentication via b…EPSS 0.42%9.1CVE-2021-23921Devolutions server vulnerabilityAn issue was discovered in Devolutions Server before 2020.3. There is broken access control on Password List entry elements.EPSS 1.00%9.0CVE-2025-11957Devolutions server insecure direct object reference vulnerabilityImproper authorization in the temporary access workflow of Devolutions Server 2025.2.12.0 and earlier allows an authenticated basic user to self-appr…EPSS 0.33%8.8CVE-2026-17568Devolutions server incorrect authorization vulnerabilityImproper access control in the role membership management endpoint in Devolutions Server allows an authenticated non-administrative user holding the …EPSS 0.42%

Source: NIST National Vulnerability Database (record CVE-2026-3204), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.