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Advisory record · GHSA-8c7c-h7px-267g

Concrete CMS is vulnerable to IDOR in surveys

CVSS 6.3 MediumEPSS 0.0019 · 9th 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<9.5.19.5.1
Identifiers
GHSA-8c7c-h7px-267g · CVE-2026-8337 · PKSA-wqcg-9fxw-b667
Weakness (CWE)
CWE-565 · CWE-639
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 versions before 9.5.1 (Packagist package concrete5/concrete5) contain an insecure direct object reference in surveys. The issue only applies when a site has both public and private surveys, and an unauthenticated attacker could vote in a restricted survey by submitting its option ID through a public survey's endpoint. Upgrade to version 9.5.1 or later.

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
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (ConcreteCMS)
  • CISA KEV Not listed.
  • EPSS 0.0019, the 9th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:59 UTC First seen by agentprime
  2. 31 Oct 2026, 13:59 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.