CVE-2026-112777

High

Description

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.

SeverityHigh

CVSS7.2

Exploit probability—

ProductCms

PublishedOct 19, 2026

First seenOct 19, 2026

Weakness typeCWE-184CWE-184

How to fix

Update

craftcms cms4.18.8, 5.11.0 or later

Vendor advisories

github.com/craftcms/cms/security/advisories/GHSA-w643-x88w-6wcm

Affected products

Product	Affected versions	Fixed in
craftcms cms	4.0.0 ≤ v < 4.18.8, 5.0.0 ≤ v < 5.11.0	4.18.8, 5.11.0

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

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