CVE-2026-86732 Details
Description
Craft CMS versions before 5.10.12 contain a remote code execution vulnerability in the element-index endpoint that allows authenticated content editors to instantiate arbitrary classes through the criteria parameter. Attackers can inject a malicious class via criteria[withTransforms][0][class] that reaches ImageTransforms::normalizeTransform(), then use a PHP gadget chain with yii\rbac\PhpManager to execute code by pointing itemFile to a request log containing PHP payload in the User-Agent header.
A remote code execution vulnerability exists in Craft CMS versions prior to 5.10.12, specifically within the element-index endpoint. This issue allows authenticated content editors to instantiate arbitrary classes by manipulating the criteria parameter. The vulnerability arises because the element-index controller does not properly validate the injected class names, enabling editors to execute malicious code on the server. Exploitation involves using a PHP gadget chain with yii\rbac\PhpManager to execute code by directing the itemFile parameter to a request log containing PHP payloads in the User-Agent header.
Users can upgrade to Craft CMS version 5.10.12 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 8, 2026CISA-ADP
Assessed Sep 10, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/craftcms/cms/security/advisories/GHSA-9wcj-wqqh-cqvg | [email protected] | AdvisoryExploitTechnical AnalysisVendor |
| https://www.vulncheck.com/advisories/craft-cms-before-5.10.12-remote-code-execution-via-element-index | [email protected] | Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Craft CMS | >= 5.0.0-RC1, < 5.10.12 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 10, 2026 | CVE Modified | CISA-ADP |
| Sep 8, 2026 | New CVE Received | [email protected] |