---
id: CVE-2026-109308
title: >-
  Craft CMS 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 passes the raw
  'updates' request parameter in AppController::actionCacheUpdates to
  UpdatesModel without Component::cleanseConfig(), allowing behavior and
  event-handler injection
summary: >-
  Craft CMS 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 passes the raw
  'updates' request parameter in AppController::actionCacheUpdates to
  UpdatesModel without Component::cleanseConfig(), allowing behavior and
  event-handler injection. Aut…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: craftcms
product: cms
affected:
  - cms >= 4.0.0 < 4.18.7
  - cms >= 5.0.0 < 5.10.14
published: '2026-10-12'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:15:07.947'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109308'
references:
  - url: 'https://github.com/craftcms/cms/security/advisories/GHSA-5m2g-hhqr-84pc'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/craft-cms-4.0.0-before-4.18.7-and-5.0.0-before-5.10.14-rce-via-actioncacheupdates-behavior-injection
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.0049
epssPercentile: 0.42276
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T15:46:56.285080Z'
ingestedAt: '2026-10-12T18:00:08.196Z'
---

## Overview

Craft CMS 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 passes the raw 'updates' request parameter in AppController::actionCacheUpdates to UpdatesModel without Component::cleanseConfig(), allowing behavior and event-handler injection. Authenticated control panel users with the performUpdates permission or Updates-utility access can supply 'as' or 'on' keys, such as an AttributeTypecastBehavior gadget, to execute arbitrary code.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.