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Advisory record · GHSA-xjg6-5v39-v7fc

Concrete CMS is vulnerable to CSRF via Backend\File::approveVersion

CVSS 2.3 LowEPSS 0.0010 · 1st percentile

Published by the GitHub Advisory Database at 26 May 2026, 13:30 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-xjg6-5v39-v7fc · CVE-2026-8340 · PKSA-ft53-g53d-bkdk
Weakness (CWE)
CWE-352
Tags
Published
26 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 below 9.5.1 are affected. An attacker can use a cross-site request forgery attack against a logged-in user who has the edit_file_contents permission, causing that user's account to publish a version of a file the attacker chooses, such as reverting to an older version or activating another editor's unpublished version. Upgrade to version 9.5.1, which contains the fix.

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 0.0010, 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, 14:01 UTC First seen by agentprime
  2. 31 Oct 2026, 14:01 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.