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CVE-2026-31857— CraftCMS has an RCE vulnerability via relational conditionals in the control panel

Quick assessment

Affected
craftcms cms
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 5.9.9之前版本和4.17.4之前版本存在代码注入漏洞，该漏洞源于BaseElementSelectConditionRule::getElementIds方法传递用户输入至未沙箱化的Twig渲染函数，可能导致远程代码执行。

AI Predicted 9.9 Difficulty: Easy EPSS 0.89% · P58
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I. Basic Information for CVE-2026-31857

Vulnerability Information
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Vulnerability Title
CraftCMS has an RCE vulnerability via relational conditionals in the control panel
Source: CVE Program / CVE List V5
Vulnerability Description
Craft is a content management system (CMS). Prior to 5.9.9 and 4.17.4, a Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system. The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled. Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints. This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true). Users should update to the patched 5.9.9 or 4.17.4 release to mitigate the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 5.9.9之前版本和4.17.4之前版本存在代码注入漏洞，该漏洞源于BaseElementSelectConditionRule::getElementIds方法传递用户输入至未沙箱化的Twig渲染函数，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms >= 5.0.0-RC1, < 5.9.9 -

II. Public POCs for CVE-2026-31857

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 14856 chars
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III. Intelligence Information for CVE-2026-31857

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Patches & Fixes for CVE-2026-31857 (1)

Vendor Advisories for CVE-2026-31857 (1)

Same Patch Batch · craftcms · 2026-03-11 · 4 CVEs total

CVE-2026-31859 Craft has Reflective XSS via incomplete return URL sanitization
CVE-2026-31867 Craft Commerce has a Potential IDOR in Commerce carts
CVE-2026-31858 CraftCMS's `ElementSearchController` Affected by Blind SQL Injection

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-94

V. Comments for CVE-2026-31857

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