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Advisory record · GHSA-qj94-6rx6-27fr

Concrete CMS is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file addFavoriteFolder($id)

CVSS 2.3 LowEPSS 0.0013 · 2nd percentile

Published by the GitHub Advisory Database at 22 May 2026, 00:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
concrete5/concrete5Packagist>=9.0.0RC1, <9.5.19.5.1
Identifiers
GHSA-qj94-6rx6-27fr · CVE-2026-8416 · PKSA-4vdj-385c-kbs8
Weakness (CWE)
CWE-352 · CWE-1275
Tags
Published
22 May 2026
Updated
10 Sept 2026

Machine-written summary

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

Concrete CMS (Packagist package concrete5/concrete5) versions 9.0.0RC1 up to but not including 9.5.1 are vulnerable to cross-site request forgery in the file controller's addFavoriteFolder function. An attacker would need to get a logged-in user to visit a malicious page, which could then cause unintended favorite-folder actions on the user's behalf. The fix is to upgrade to version 9.5.1.

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
2.3 Low 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (ConcreteCMS)
  • CISA KEV Not listed.
  • EPSS 0.0013, the 2nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:58 UTC First seen by agentprime
  2. 31 Oct 2026, 13:58 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.