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Craft CMS CVE-2026-56382

| EUVDEUVD-2026-38176 HIGH
Code Injection (CWE-94)
2026-06-21 VulnCheck GHSA-pmm4-v8f6-4vpp
Code Injection RCE PHP Cms
8.6
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.2 HIGH

Network-reachable admin endpoint (AV:N/AC:L), requires admin authentication (PR:H), no user interaction, and arbitrary PHP execution yields full C/I/A impact within the application scope.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jun 22, 2026 - 06:07 vuln.today
Patch available
Jun 21, 2026 - 15:31 EUVD

DescriptionCVE.org

Craft CMS (composer package craftcms/cms) versions >= 5.5.0 and <= 5.9.13 contain a remote code execution vulnerability in the FieldsController::actionRenderCardPreview() method, which passes the fieldLayoutConfig POST parameter directly to Fields::createLayout() without calling Component::cleanseConfig(). An authenticated admin user can inject Yii2 event handlers (e.g., 'on init' keys) via the fieldLayoutConfig parameter to execute arbitrary PHP code and disclose sensitive information (such as environment variables containing database credentials and CRAFT_SECURITY_KEY). The issue is fixed in version 5.9.14.

AnalysisAI

Authenticated remote code execution in Craft CMS versions 5.5.0 through 5.9.13 allows admin users to execute arbitrary PHP by injecting Yii2 event handlers via the fieldLayoutConfig POST parameter to FieldsController::actionRenderCardPreview(). The flaw stems from missing Component::cleanseConfig() sanitization, enabling disclosure of environment variables including database credentials and CRAFT_SECURITY_KEY. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain Craft CMS admin credentials
Delivery
Authenticate to /admin control panel
Exploit
Send crafted POST to fields/render-card-preview with malicious fieldLayoutConfig
Install
Yii2 instantiates layout with attacker-controlled 'on init' handler
C2
Arbitrary PHP executes in web server context
Execute
Exfiltrate CRAFT_SECURITY_KEY and DB credentials
Impact
Pivot to full application and database takeover
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Vulnerability AssessmentAI

Exploitation Requires valid Craft CMS admin-level authentication to reach the FieldsController::actionRenderCardPreview() endpoint (the CVSS vector specifies PR:H, confirming high-privilege admin access is mandatory, not merely an authenticated low-privilege user). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H produces an 8.6 (High), reflecting network-reachable exploitation against the admin control panel with high impact across confidentiality, integrity, and availability - but the PR:H requirement (admin authentication) is the critical limiter. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained Craft CMS admin credentials (via phishing, credential stuffing, or a separately compromised account) logs into the control panel and sends a crafted POST request to the fields/render-card-preview endpoint with a fieldLayoutConfig payload containing an 'on init' Yii2 event handler that executes arbitrary PHP. The handler reads environment variables and returns the CRAFT_SECURITY_KEY and database credentials, granting the attacker full application takeover and the ability to forge signed tokens. …
Remediation Vendor-released patch: upgrade craftcms/cms to version 5.9.14 or later via composer (composer require craftcms/cms:^5.9.14), as documented in the vendor advisory at https://github.com/craftcms/cms/security/advisories/GHSA-86vw-x4ww-x467 and detailed by VulnCheck at https://www.vulncheck.com/advisories/craft-cms-remote-code-execution-via-missing-config-sanitization-in-fieldscontroller. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit systems to identify all Craft CMS instances in versions 5.5.0-5.9.13 and verify which are actively in use. …

Sign in for detailed remediation steps and compensating controls.

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

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CVE-2026-56382 vulnerability details – vuln.today
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