What is the CVSS score of EUVD-2026-12166?

EUVD-2026-12166 has a CVSS 3.0 base score of 8.8 (High). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.6%.

Which versions of PHP are affected by EUVD-2026-12166?

CVE-2026-3838 is a high-severity vulnerability affecting all Unraid versions that permits authenticated users to execute arbitrary code with root privileges.

How to fix or mitigate EUVD-2026-12166?

Within 24 hours: Identify and inventory all Unraid instances in your environment and restrict network access to update.php to essential administrators only. Within 7 days: Implement network segmentation to isolate Unraid systems and deploy WAF rules blocking POST requests to update.php from untrusted sources; evaluate whether Unraid is critical to operations. Within 30 days: Contact Unraid for patch availability; if unavailable, prepare migration plan to alternative solutions or maintain air-gapped deployment with strict access controls pending vendor remediation.

PHP EUVD-2026-12166

| CVE-2026-3838 HIGH

Path Traversal (CWE-22)

2026-03-13 zdi

PHP Path Traversal RCE Unraid

8.8

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 13, 2026 - 21:01 euvd

EUVD-2026-12166

Analysis Generated

Mar 13, 2026 - 21:01 vuln.today

CVE Published

Mar 13, 2026 - 20:37 nvd

HIGH 8.8

DescriptionCVE.org

Unraid Update Request Path Traversal Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Unraid. Authentication is required to exploit this vulnerability.

The specific flaw exists within the update.php file. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-28951.

AnalysisAI

Critical path traversal vulnerability in Unraid's update.php file that allows authenticated remote attackers to execute arbitrary code as root. The vulnerability affects all versions of Unraid (per CPE data) and was discovered by Zero Day Initiative (ZDI-CAN-28951). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to Unraid

Exploit

Send crafted path parameter to update.php

Execution

Traverse directory structure with path traversal

Impact

Execute arbitrary code as root

Access

Authenticate to Unraid

Exploit

Send crafted path parameter to update.php

Execution

Traverse directory structure with path traversal

Impact

Execute arbitrary code as root

Vulnerability AssessmentAI

Exploitation	Valid Unraid user credentials required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	This vulnerability presents a high real-world risk based on multiple factors: The CVSS vector (AV:N/AC:L/PR:L/UI:N) indicates it's remotely exploitable with low complexity and requires only low-level authentication. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker with valid Unraid credentials (obtained through phishing, credential stuffing, or insider access) connects to the Unraid web interface remotely. They craft a malicious request to update.php containing directory traversal sequences (e.g., '../../../') in the path parameter. …
Remediation	No specific patch information is available in the provided data. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Identify and inventory all Unraid instances in your environment and restrict network access to update.php to essential administrators only. …

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-12166 vulnerability details – vuln.today

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PHP EUVD-2026-12166

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

More from same product – last 7 days

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External POC / Exploit Code