craftcms Craft CMS up to 4.18.7/5.10.9 Class Name Check create information disclosure

Summaryinfo

A vulnerability identified as problematic has been detected in craftcms Craft CMS up to 4.18.7/5.10.9. Impacted is the function create of the component Class Name Check. This manipulation causes information disclosure. This vulnerability is registered as CVE-2026-112777. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in craftcms Craft CMS up to 4.18.7/5.10.9. Affected by this vulnerability is the function create of the component Class Name Check. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

Craft CMS 4.x before 4.18.8 and 5.x before 5.11.0 contains a blocklist bypass in the Twig create() function because its class-name checks are case-sensitive while PHP class resolution is not. Attackers with template-execution rights, such as Control Panel administrators, can instantiate SplFileObject via a lowercase class name to read .env secrets or write a PHP file into the webroot for remote code execution.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-112777 since 10/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 4.18.8 or 5.11.0 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• craftcms

Name

• Craft CMS

Version

• 4.18.0
• 4.18.1
• 4.18.2
• 4.18.3
• 4.18.4
• 4.18.5
• 4.18.6
• 4.18.7
• 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

License

• free

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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