CVE-2026-112777

Craft CMS before 4.18.8 and 5.11.0 Twig create() Blocklist Bypass Leading to RCE

State: Published
Severity: 8.7 High
Published: Oct 19, 2026
Updated: Oct 20, 2026
Reserved: Oct 19, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	7.2 High	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-184 Incomplete List of Disallowed Inputs

Affected Products

Product	Versions
cmscraftcms	4.0.0 to before 4.18.8Affected 4.18.8Not affected
cmscraftcms	5.0.0 to before 5.11.0Affected 5.11.0Not affected

References

GitHub Security Advisory (GHSA-w643-x88w-6wcm)vendor-advisory
VulnCheck Advisory: Craft CMS before 4.18.8 and 5.11.0 Twig create() Blocklist Bypass Leading to RCEthird-party-advisory

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