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CVE-2026-86730— Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Craft CMS是Craft CMS公司的一套内容管理系统(CMS)。 Craft CMS 5.10.12之前版本存在代码注入漏洞，该漏洞源于对字符串类型字段布局元素清理不当，经过身份验证的控制面板用户可通过发布JSON字符串形式的字段布局选项卡元素绕过清理验证，注入Yii2行为附件和事件处理程序，从而触发任意对象实例化和代码执行。

CVSS 8.8 · High EPSS 0.39% · P33

Affected Version Matrix 2

VendorProduct Version RangeStatus
craftcms cms 5.0.0-RC1< 5.10.12 affected
5.10.12 unaffected
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I. Basic Information for CVE-2026-86730

Vulnerability Information
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Vulnerability Title
Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Craft CMS是Craft CMS公司的一套内容管理系统(CMS)。 Craft CMS 5.10.12之前版本存在代码注入漏洞，该漏洞源于对字符串类型字段布局元素清理不当，经过身份验证的控制面板用户可通过发布JSON字符串形式的字段布局选项卡元素绕过清理验证，注入Yii2行为附件和事件处理程序，从而触发任意对象实例化和代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms 5.0.0-RC1 ~ 5.10.12 -

II. Public POCs for CVE-2026-86730

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III. Intelligence Information for CVE-2026-86730

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Vendor Advisories for CVE-2026-86730 (2)

Same Patch Batch · craftcms · 2026-09-08 · 3 CVEs total

CVE-2026-86732 8.8 HIGH Craft CMS before 5.10.12 Remote Code Execution via element-index
CVE-2026-86731 6.5 MEDIUM Craft CMS 5.0.0-RC1 before 5.10.12 Permission Escalation via UsersController

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-94

V. Comments for CVE-2026-86730

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