Vulnerability · Published Jun 21, 2026 · Assigned by VulnCheck

CVE-2026-56382Craft CMS - Remote Code Execution via Missing Config Sanitization in FieldsController

High 7.2

In plain English

A high-severity code injection in cms from craftcms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.7%top 47.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	craftcms/cms	5.9.14	GHSA-86vw-x4ww-x467

Affected products (as reported)

Vendor	Product	Versions
craftcms	cms	5.5.0 – before 5.9.14

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

GHSA Advisory GHSA-86vw-x4ww-x467 vendor-advisory
VulnCheck Advisory: Craft CMS - Remote Code Execution via Missing Config Sanitization in FieldsController third-party-advisory