CVE-2026-86730
Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE
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().
INFO
Published Date :
Sept. 8, 2026, 3:14 p.m.
Last Modified :
Sept. 8, 2026, 3:14 p.m.
Remotely Exploit :
Yes !
Source :
VulnCheck
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 |
Solution
- Update Craft CMS to version 5.10.12 or later.
- Apply vendor patches for affected versions.
- Review all deployed field-layout configurations.
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CVE-2026-86730 vulnerability anywhere in the article.