How severe is CVE-2026-3204?

CVE-2026-3204 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3204 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3204?

CVE-2026-3204 affects Devolutions Devolutions Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3204?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-3204 have an EU (EUVD) identifier?

Yes. CVE-2026-3204 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9337.

When was CVE-2026-3204 published?

CVE-2026-3204 was published on 2026-03-03 and last updated on 2026-06-17.

CVE-2026-3204

CVE-2026-3204 is a critical-severity vulnerability in Devolutions Devolutions Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9337
Weakness: CWE-20
Affected product: Devolutions Devolutions Server
Published: 2026-03-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3204?: CVE-2026-3204 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3204 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3204?: CVE-2026-3204 affects Devolutions Devolutions Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3204?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-3204 have an EU (EUVD) identifier?: Yes. CVE-2026-3204 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9337.
When was CVE-2026-3204 published?: CVE-2026-3204 was published on 2026-03-03 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:devolutions:devolutions_server:*:*:*:*:*:*:*:*

More vulnerabilities in Devolutions Devolutions Server

CVE-2026-3224 — Critical (CVSS 9.8): Authentication bypass in the Microsoft Entra ID (Azure AD) authentication mode in Devolutions Server 2025.3.15.0 and…
CVE-2026-3130 — Critical (CVSS 9.8): Improper Enforcement of Behavioral Controls in Devolutions Server 2025.3.15 and earlier allows an authenticated…
CVE-2026-0610 — Critical (CVSS 9.8): SQL Injection vulnerability in remote-sessions in Devolutions Server.This issue affects Devolutions Server 2025.3.1…
CVE-2024-2921 — Critical (CVSS 9.8): Improper access control in PAM vault permissions in Devolutions Server 2024.1.10.0 and earlier allows an authenticated…
CVE-2021-23921 — Critical (CVSS 9.1): An issue was discovered in Devolutions Server before 2020.3. There is broken access control on Password List entry…
CVE-2026-14536 — High (CVSS 8.8): Improper enforcement of a mandatory multi-factor authentication policy in Devolutions Server 2026.2.9.0 allows an…

All CVEs affecting Devolutions Devolutions Server →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →