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Vulnerabilities

Vulnerability · GHSA-j6r9-fxgv-j7x5

Authenticated admin RCE via Content Block field-layout JSON-string cleanse

Published Oct 5, 2026 · catalog updated Oct 5, 2026 · Authenticated admin RCE via

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for GHSA-j6r9-fxgv-j7x5. A missing EPSS score is not a low risk. Compare Authenticated admin RCE via with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Authenticated admin RCE via).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Low—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Version ranges on file
Affected products
composer craftcms/cms

This requires to be enabled, which is against [security recommendations](https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production). accepts a field-layout config, JSON-decodes it after the sanitization boundary, and passes the result to , which calls with no re-cleanse. A surviving top-level / key (a Yii behavior/event gadget) is therefore honored during object hydration, attaching an attacker-controlled behavior/event handler to the — the same terminal gadget abused by GHSA-265m-7826-wjqm — yielding authenticated admin remote code execution as the web user. This is a distinct, unpatched caller of the object-config → behavior-injection RCE family. Craft has patched this family caller-by-caller ( , for GHSA-7jx7-3846-m7w7; for GHSA-2fph-6v5w-89hh; for ) and never converted to cleanse internally, leaving untouched. ### Impact Authenticated admin (with , the default) achieves OS command execution as the web/PHP user, plus secret/environment disclosure — identical terminal impact to GHSA-265m-7826-wjqm and GHSA-7jx7-3846-m7w7. Report ID: 1716

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • composer craftcms/cms>= 5.8.0, < 5.11.0

How to fix GHSA-j6r9-fxgv-j7x5

  • Upgrade

    GHSA-j6r9-fxgv-j7x5 lists a fix boundary at 5.11.0. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 5.11.0

  • Advisory

    Open the inventory_github record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for GHSA-j6r9-fxgv-j7x5. A missing EPSS score is not a low risk. Compare Authenticated admin RCE via with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with >= 5.8.0, < 5.11.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-94: Code Injection. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Craft CMS security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 5, 2026 · Maintainer security tabs

    Detected

    This requires to be enabled, which is against [security recommendations](https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production). accepts a field-layout config, JSON-decodes it after the sanitization boundary, and passes the result to , which calls with no re-cleanse. A surviving top-level / key (a Yii behavior/event gadget) is therefore honored during obje

Sources

  • Maintainer security tabsVendor advisoryGHSA-j6r9-fxgv-j7x5

    This requires to be enabled, which is against [security recommendations](https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production). accepts a field-layout config, JSON-decodes it after the sanitization boundary, and passes the result to , which calls with no re-cleanse. A surviving top-level / key (a Yii behavior/event gadget) is therefore honored during obje

    github.com

Freshness

Last verified in this catalog Oct 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Maintainer security tabsNov 1, 2026