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Advisory record · GHSA-fp5j-j7j4-mcxc

CraftCMS has an RCE vulnerability via relational conditionals in the control panel

CVSS 8.1 HighEPSS 0.011 · 66th percentile

Published by the GitHub Advisory Database at 11 Mar 2026, 14:56 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
craftcms/cmsPackagist>=5.0.0-RC1, <5.9.9 || >=4.0.0-beta.1, <4.17.45.9.9, 4.17.4
Identifiers
GHSA-fp5j-j7j4-mcxc · CVE-2026-31857 · PKSA-w79g-q9vy-mw7b
Weakness (CWE)
CWE-94
Tags
Published
11 Mar 2026
Updated
13 Mar 2026

Machine-written summary

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

Craft CMS (craftcms/cms) versions from 4.0.0-beta.1 up to 4.17.4, and from 5.0.0-RC1 up to 5.9.9, are affected. Any authenticated Control Panel user, including Author and Editor roles, can achieve remote code execution by sending a crafted condition rule to element listing endpoints. Upgrade to 4.17.4 or 5.9.9.

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
8.1 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.011, the 66th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:26 UTC First seen by agentprime
  2. 31 Oct 2026, 14:26 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.