Is CVE-2026-112777 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-112777?

CVE-2026-112777 has a CVSS v3 severity of HIGH (7.2).

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CVE-2026-112777

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.