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Advisory record · GHSA-r42c-3rr2-jrfp

Concrete CMS is Vulnerable to Cross-Site Request Forgery

CVSS 7.5 HighEPSS 0.0012 · 1st percentile

Published by the GitHub Advisory Database at 21 May 2026, 21:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
concrete5/concrete5Packagist<9.5.19.5.1
Identifiers
GHSA-r42c-3rr2-jrfp · CVE-2026-8140 · PKSA-krdd-qg62-29s4
Weakness (CWE)
CWE-352
Tags
Published
21 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 concrete5/concrete5 versions below 9.5.1 are affected. The package-install download endpoint does not check a CSRF token, so an attacker who can get an authenticated administrator with package-install rights to visit a crafted page can make the site download an arbitrary marketplace package to the server, provided the site is connected to the Concrete marketplace. 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
7.5 High 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (ConcreteCMS)
  • CISA KEV Not listed.
  • EPSS 0.0012, the 1st percentile, on 11 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.