CVE-2026-86730 Details
Description
Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers. Attackers can post field-layout tab elements as JSON strings to bypass cleanse validation, then trigger arbitrary object instantiation and code execution through Craft::createObject().
A remote code execution vulnerability has been identified in Craft CMS versions 5.0.0-RC1 prior to 5.10.12. This issue arises because the application fails to properly sanitize string-typed field-layout elements. As a result, authenticated control-panel users can inject Yii2 behavior attachments and event handlers. Exploitation involves posting field-layout tab elements as JSON strings to evade validation, which can then be used to trigger arbitrary object instantiation and code execution via the Craft::createObject() method.
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 8, 2026References to Advisories, Solutions, and Tools
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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 8, 2026 | New CVE Received | [email protected] |
| Sep 8, 2026 | CVE Modified | CISA-ADP |