Craftcms CMS up to 5.10.11 Field Layout Craft::createObject injection

Summaryinfo

A vulnerability was found in Craftcms CMS up to 5.10.11 and classified as problematic. This vulnerability affects the function Craft::createObject of the component Field Layout. Executing a manipulation can lead to injection. This vulnerability is handled as CVE-2026-86730. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Craftcms CMS up to 5.10.11. It has been declared as problematic. This vulnerability affects the function Craft::createObject of the component Field Layout. The manipulation with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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().

The advisory is available at github.com. This vulnerability was named CVE-2026-86730 since 09/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

Upgrading to version 5.10.12 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• Craftcms

Name

• CMS

Version

• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11

Website

• Product: https://github.com/craftcms/cms/

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