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Advisory record · GHSA-jr5g-qv3g-rxxx

Concrete does not validate a CSRF token before processing requests to `/dashboard/extend/update/do_update/<pkgHandle>`

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-jr5g-qv3g-rxxx · CVE-2026-8417 · PKSA-8c12-5257-gxrx
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 (Packagist package concrete5/concrete5) versions below 9.5.1 are affected. An attacker can make a logged-in administrator who has package-installation rights trigger an upgrade of an already-installed package by tricking them into a cross-site navigation, because the relevant endpoint does not validate a CSRF token. Upgrade to version 9.5.1 or later, which is the fixed release.

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, 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.