CVE-2026-86730
Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 8, 2026
- Updated
- Sep 8, 2026
- Reserved
- Sep 8, 2026
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().
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-94 Improper Control of Generation of Code ('Code Injection')
Affected Products
| Product | Versions |
|---|---|
cmscraftcms |
|
References
- GitHub Security Advisory (GHSA-qj4v-m29p-fj4m)vendor-advisory
- VulnCheck Advisory: Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCEthird-party-advisory
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