High severity · published Jun 21, 2026
CVE-2026-56382
Craft CMS - Remote Code Execution via Missing Config Sanitization in FieldsController
7.2
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
cms · craftcms
5.5.0 before 5.9.14 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56382
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56382
github.com
https://github.com/craftcms/cms/security/advisories/GHSA-86vw-x4ww-x467
www.vulncheck.com
https://www.vulncheck.com/advisories/craft-cms-remote-code-execution-via-missing-config-sanitization-in-fieldscontroller
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