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Server CVE-2026-4434

| EUVDEUVD-2026-13688 HIGH
Improper Certificate Validation (CWE-295)
2026-03-20 DEVOLUTIONS
Information Disclosure Server
8.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

6
Analysis Updated
Apr 16, 2026 - 06:19 EUVD-patch-fix
executive_summary
Re-analysis Queued
Apr 16, 2026 - 05:29 backfill_euvd_patch
patch_released
Patch available
Apr 16, 2026 - 05:29 EUVD
2026.1
EUVD ID Assigned
Mar 20, 2026 - 13:45 euvd
EUVD-2026-13688
Analysis Generated
Mar 20, 2026 - 13:45 vuln.today
CVE Published
Mar 20, 2026 - 12:52 nvd
HIGH 8.1

DescriptionCVE.org

Improper certificate validation in the PAM propagation WinRM connections allows a network attacker to perform a man-in-the-middle attack via disabled TLS certificate verification.

AnalysisAI

Devolutions Server contains an improper certificate validation vulnerability in its PAM propagation WinRM connections that allows network attackers to conduct man-in-the-middle (MITM) attacks by exploiting disabled TLS certificate verification. This vulnerability affects Devolutions Server versions prior to 2026.1, enabling attackers positioned on the network path to intercept and manipulate WinRM communications without detection. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Position self on network path
Delivery
Intercept WinRM PAM propagation connection
Exploit
Present forged certificate
Execution
Exploit disabled TLS validation
Persist
Decrypt/modify WinRM traffic
Impact
Execute arbitrary commands
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Vulnerability AssessmentAI

Exploitation Requires WinRM PAM propagation connections configured with TLS certificate verification disabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This vulnerability presents a high real-world risk despite the absence of a CVSS score in the provided data. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker positioned on the network between a Devolutions Server instance and target Windows systems (e.g., via compromised network infrastructure, ARP spoofing, or DNS hijacking) intercepts WinRM connections initiated by Devolutions Server for PAM credential propagation. Because certificate validation is disabled, the attacker presents a self-signed certificate that is accepted without verification. …
Remediation Immediately upgrade Devolutions Server to version 2026.1 or later, which includes the certificate validation fix. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all Devolutions Server instances and identify versions prior to 2026.1; document current version numbers and deployment scope. …

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CVE-2026-4434 vulnerability details – vuln.today
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