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Advisory record · GHSA-f74w-488g-8x5r

Craft CMS: Potential authenticated Remote Code Execution via referrer redirect

CVSS 8.7 HighEPSS 0.0041 · 35th percentile

Published by the GitHub Advisory Database at 6 Jul 2026, 21:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
craftcms/cmsPackagist>=5.9.0, <5.10.05.10.0
Identifiers
GHSA-f74w-488g-8x5r · CVE-2026-55794 · PKSA-hvdm-8k9p-kcdw
Weakness (CWE)
CWE-94 · CWE-1336
Tags
Published
6 Jul 2026
Updated
10 Sept 2026

Machine-written summary

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

Craft CMS (craftcms/cms, Packagist) versions 5.9.0 up to but not including 5.10.0 are affected. A control panel user who has permission to edit entries can run unsandboxed Twig code by manipulating the HTTP Referer header when saving an entry, because the signed redirect URL taken from that header is compiled as a Twig template. Upgrade to Craft CMS 5.10.0 or later, which fixes the issue.

Written 31 Oct 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
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0041, the 35th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:00 UTC First seen by agentprime
  2. 31 Oct 2026, 14:00 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.