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Advisory record · GHSA-f54h-78c9-c24h

Concrete CMS: OAuth 2.0 Authorization-Code Handler Bypasses Account Status

CVSS 2.3 LowEPSS 0.0017 · 6th 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-f54h-78c9-c24h · CVE-2026-7887 · PKSA-td7z-y5jc-79yq
Weakness (CWE)
CWE-1287
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.

The Packagist package concrete5/concrete5 (Concrete CMS) is vulnerable in versions before 9.5.1. The OAuth 2.0 authorization-code handler does not check account status, so a user whose account is inactive (uIsActive=0, such as suspended or banned accounts) can still authenticate via OAuth and receive valid API tokens. The source does not describe what access the attacker needs beyond holding such an account. 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:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N CNA (ConcreteCMS)
  • CISA KEV Not listed.
  • EPSS 0.0017, the 6th 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.