CVE-2026-112777

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

Published Oct 19, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Craftcms cms
Vendors & Products Craftcms cms
Type Values Removed Values Added
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.
Title Craft CMS before 4.18.8 and 5.11.0 Twig create() Blocklist Bypass Leading to RCE
First Time appeared Craftcms
Craftcms craft Cms
Weaknesses CWE-184
CPEs cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*
Vendors & Products Craftcms
Craftcms craft Cms
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 20, 2026, 4:09 PM
Reserved
Oct 19, 2026, 6:10 PM
Status
Deferred
Published
Oct 19, 2026, 8:17 PM
Modified
Oct 20, 2026, 5:17 PM