CVE-2026-56382

High

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.

SeverityHigh

CVSS7.2

Exploit probability—

ProductCraftcms/cms

PublishedJun 21, 2026

First seenJun 21, 2026

Weakness typeCWE-94Code injection

How to fix

Update

craftcms/cms5.9.14 or later

Vendor advisories

github.com/craftcms/cms/security/advisories/GHSA-86vw-x4ww-x467

Affected products

Product	Affected versions	Fixed in
craftcms/cmsPackagist	5.5.0 ≤ v < 5.9.14	5.9.14

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