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Advisory record · GHSA-wmw3-3fv3-h54w

Concrete CMS has a session-hardening bypass and allows password change without reauthorization

CVSS 5.3 MediumEPSS 0.0018 · 7th 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-wmw3-3fv3-h54w · CVE-2026-8327 · PKSA-5dbv-8tcv-hjg5
Weakness (CWE)
CWE-269 · CWE-620 · CWE-915
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 below 9.5.1 (Packagist package concrete5/concrete5) are affected. The user-profile edit controller passes the entire raw POST array to UserInfo::update() without field whitelisting, which lets a registered user change their password without supplying the current password and disable the per-user IP pinning that the session validator uses to detect hijacking. Upgrade to version 9.5.1, which fixes the issue.

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
5.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (ConcreteCMS)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 7th percentile, on 5 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.