Remote Code Execution in Craft CMS from Craft
CVE-2026-31857

8.1HIGH

Key Information:

Vendor

Craftcms

Status
Cms
Vendor
CVE Published:
11 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-31857?

Craft CMS has a remote code execution vulnerability due to improper handling of user-controlled input in the conditions system prior to version 5.9.9 and 4.17.4. The affected method, BaseElementSelectConditionRule::getElementIds(), makes use of the unprotected renderObjectTemplate() function, allowing any authenticated Control Panel user—including those with non-admin roles like Author or Editor—to execute arbitrary code by sending a specially crafted condition rule through standard element listing endpoints. This flaw does not require admin privileges or special permissions, making it particularly dangerous as it bypasses existing production hardening settings. For protection, users are urged to update to the patched versions as soon as possible.

Affected Version(s)

cms >= 5.0.0-RC1, < 5.9.9 < 5.0.0-RC1, 5.9.9

cms >= 4.0.0-beta.1, < 4.17.4 < 4.0.0-beta.1, 4.17.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-31857-PoC
Created by kaizoku73

References

https://github.com/craftcms/cms/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d...
x_refsource_MISC

CVSS V4

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • đź‘ľ

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.