CVE-2026-86730
Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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().
| CWE | CWE-94 |
| Vendor | craftcms |
| Product | cms |
| Published | Sep 8, 2026 |
| Last Updated | Sep 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
craftcms / cms
5.0.0-RC1 < 5.10.12