CVE-2026-31857Network attack vector

Authenticated RCE via unsandboxed relational condition templates

Published Mar 11, 2026 · Updated Mar 11, 2026

Remote code execution in Pixel & Tonic Craft CMS before 4.17.4 and 5.9.9 allows remote authenticated users to execute arbitrary code. BaseElementSelectConditionRule::getElementId() sends a user-controlled element ID template to renderObjectTemplate(), which renders Twig without sandboxing or escaping. Any Control Panel account, including Author or Editor roles, can submit the condition through element-listing endpoints despite production hardening settings.

CVSS severity8.8
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Pixel & Tonic Craft CMS before 4.17.4 and 5.9.9 allows remote authenticated users to execute arbitrary code. BaseElementSelectConditionRule::getElementId() sends a user-controlled element ID template to renderObjectTemplate(), which renders Twig without sandboxing or escaping. Any Control Panel account, including Author or Editor roles, can submit the condition through element-listing endpoints despite production hardening settings.

The record

CVE
CVE-2026-31857
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.0-beta.1, < 4.17.4
  2. Affected versionversion=>= 5.0.0-RC1, < 5.9.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=>= 4.0.0-beta.1, < 4.17.4; version=>= 5.0.0-RC1, < 5.9.9

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.1GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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