Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-86vw-x4ww-x467

Craft CMS: RCE via missing cleanseConfig in FieldsController::actionRenderCardPreview

CVSS 8.6 HighEPSS 0.0068 · 52nd percentile

Published by the GitHub Advisory Database at 9 Jul 2026, 13:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
craftcms/cmsPackagist>=5.5.0, <5.9.145.9.14
Identifiers
GHSA-86vw-x4ww-x467 · CVE-2026-56382 · PKSA-r87g-h2pd-9vq1
Weakness (CWE)
CWE-94
Tags
Published
9 Jul 2026
Updated
6 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Craft CMS versions 5.5.0 up to but not including 5.9.14 are affected. The fieldLayoutConfig POST parameter in the card preview action is passed to layout creation without config cleansing, so an authenticated admin can inject Yii2 event handlers and achieve arbitrary code execution. Upgrade to 5.9.14 or later. The source gives few details on any workaround.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.6 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0068, the 52nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 21 Jun 2026, 13:26 UTC Confirmed by the CVE List
  2. 31 Oct 2026, 14:24 UTC First seen by agentprime
  3. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.