Craft CMS up to 5.10.11 Element Index Endpoint normalizeTransform criteria input validation

Summaryinfo

A vulnerability identified as critical has been detected in Craft CMS CMS up to 5.10.11. This affects the function ImageTransforms::normalizeTransform of the component Element Index Endpoint. Performing a manipulation of the argument criteria results in input validation. This vulnerability is identified as CVE-2026-86732. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Craft CMS CMS up to 5.10.11. This affects the function ImageTransforms::normalizeTransform of the component Element Index Endpoint. The manipulation of the argument criteria with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Craft CMS versions before 5.10.12 contain a remote code execution vulnerability in the element-index endpoint that allows authenticated content editors to instantiate arbitrary classes through the criteria parameter. Attackers can inject a malicious class via criteria[withTransforms][0][class] that reaches ImageTransforms::normalizeTransform(), then use a PHP gadget chain with yii\rbac\PhpManager to execute code by pointing itemFile to a request log containing PHP payload in the User-Agent header.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-86732 since 09/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.10.12 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• Craft CMS

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

License

• free

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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