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CVE-2026-112777— Craft CMS before 4.18.8 and 5.11.0 Twig create() Blocklist Bypass Leading to RCE

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Craft CMS 4.x（4.18.8 之前版本）和 5.x（5.11.0 之前版本）在 Twig 的 函数中存在黑名单绕过漏洞。该漏洞源于其类名检查区分大小写，而 PHP 的类解析机制不区分大小写。拥有模板执行权限的攻击者（例如控制面板管理员）可通过小写类名实例化 ，从而读取 文件中的敏感信息，或将 PHP 文件写入 Web 根目录以实现远程代码执行。

CVSS 7.2 · High

Affected Version Matrix 4

VendorProduct Version RangeStatus
craftcms cms 4.0.0< 4.18.8 affected
4.18.8 unaffected
5.0.0< 5.11.0 affected
5.11.0 unaffected
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I. Basic Information for CVE-2026-112777

Vulnerability Information
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Vulnerability Title
Craft CMS before 4.18.8 and 5.11.0 Twig create() Blocklist Bypass Leading to RCE
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms 4.0.0 ~ 4.18.8 -
craftcms cms 5.0.0 ~ 5.11.0 -

II. Public POCs for CVE-2026-112777

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III. Intelligence Information for CVE-2026-112777

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Vendor Advisories for CVE-2026-112777 (1)

Other References for CVE-2026-112777 (1)

Same Patch Batch · craftcms · 2026-10-19 · 8 CVEs total

CVE-2026-112776 9.8 CRITICAL Craft CMS 5.0.0 before 5.11.0 GraphQL Site-Scope Bypass via Mutations
CVE-2026-112770 8.8 HIGH Craft CMS before 4.18.8 and 5.11.0 Authenticated RCE via Twig group Filter Array-Callable
CVE-2026-112772 8.8 HIGH Craft CMS 5.0.0 before 5.11.0 RCE via Asset::getMimeType Transform Injection
CVE-2026-112773 8.8 HIGH Craft CMS 5.0.0 before 5.11.0 RCE via Twig Sandbox Behavior Injection
CVE-2026-112775 7.5 HIGH Craft CMS 5.0.0 before 5.11.0 Verification Code Reuse via users/set-password
CVE-2026-112774 7.2 HIGH Craft CMS 5.8.0 before 5.11.0 Admin RCE via ContentBlock Field Layout
CVE-2026-112771 6.5 MEDIUM Craft CMS before 4.18.8 and 5.11.0 Twig Sandbox Allowlist Bypass via Array Filters

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-184

V. Comments for CVE-2026-112777

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