CVE-2026-78416Network attack vector

Authenticated RCE via condition.config cleanse bypass

Published Aug 24, 2026 · Updated Aug 26, 2026

Remote code execution in Craft CMS 4.0.0-RC1 through 4.18.1 and 5.0.0-RC1 through 5.10.5 allows remote authenticated users to run commands. Conditions::createCondition decodes and merges condition.config after Component::cleanseConfig has inspected only its outer JSON string, exposing hidden Yii behavior and event keys during FieldLayout object creation. A valid control-panel session and CSRF token are required; successful exploitation runs commands as the PHP/web user and exposes application secrets and site data.

CVSS severity8.7
High
EPSS probability0.61%
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 Craft CMS 4.0.0-RC1 through 4.18.1 and 5.0.0-RC1 through 5.10.5 allows remote authenticated users to run commands. Conditions::createCondition decodes and merges condition.config after Component::cleanseConfig has inspected only its outer JSON string, exposing hidden Yii behavior and event keys during FieldLayout object creation. A valid control-panel session and CSRF token are required; successful exploitation runs commands as the PHP/web user and exposes application secrets and site data.

The record

CVE
CVE-2026-78416
Published
Aug 24, 2026
Updated
Aug 26, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-915, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.0.0-RC1 <4.18.2
  2. Affected versionversion=5.0.0-RC1 <5.10.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=4.0.0-RC1 <4.18.2; version=5.0.0-RC1 <5.10.6

Published CVSS scores

8.7HackrateCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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

CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
T1059Command and Scripting Interpreter

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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