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Vulnerabilities

Vulnerability · GHSA-xmwr-88vw-5ghh

Authenticated RCE via Twig group filter array-callable

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

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-xmwr-88vw-5ghh. A missing EPSS score is not a low risk. Compare Authenticated RCE via Twig 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 RCE via Twig).
  • 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
High—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Version ranges on file
Affected products
composer craftcms/cms

The Twig filter’s arrow argument is invoked without the guard that every other arrow-accepting filter has. takes the non-string branch for any non-string . A Twig array literal such as is a valid PHP array-callable, is not a string, and is invoked with two attacker-controlled arguments — arbitrary static/instance method invocation. When combined with , this writes an attacker-controlled webshell to the webroot, an authenticated RCE requiring no gadget. Reachability gate (identical to published advisory GHSA-f5wm-88jv-g5hx): (default false) plus authenticated Control Panel access, via B2 element-select condition rules ( , reachable by lower-privilege control panel editors). ## Impact An authenticated control panel user can achieve a remote code execution as the web user, no gadget required. Report ID: 1720

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>= 4.0.0, <= 4.18.8
  • composer craftcms/cms>= 5.0.0, < 5.11.0

How to fix GHSA-xmwr-88vw-5ghh

  • Upgrade

    GHSA-xmwr-88vw-5ghh lists a fix boundary at 4.18.8. Compare the installed build with that boundary before you change production.

  • Version check

    Affected <= 4.18.8

  • 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-xmwr-88vw-5ghh. A missing EPSS score is not a low risk. Compare Authenticated RCE via Twig with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with >= 4.0.0, <= 4.18.8, >= 5.0.0, < 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

    The Twig filter’s arrow argument is invoked without the guard that every other arrow-accepting filter has. takes the non-string branch for any non-string . A Twig array literal such as is a valid PHP array-callable, is not a string, and is invoked with two attacker-controlled arguments — arbitrary static/instance method invocation. When combined with , this writes an attacker-controlled webshell t

Sources

  • Maintainer security tabsVendor advisoryGHSA-xmwr-88vw-5ghh

    The Twig filter’s arrow argument is invoked without the guard that every other arrow-accepting filter has. takes the non-string branch for any non-string . A Twig array literal such as is a valid PHP array-callable, is not a string, and is invoked with two attacker-controlled arguments — arbitrary static/instance method invocation. When combined with , this writes an attacker-controlled webshell t

    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