---
id: CVE-2026-85387
title: >-
  Concrete CMS before 9.5.4 re-authorized OAuth REST API requests from the
  bearer token alone and did not re-check the state of the account the token had
  been issued to
summary: >-
  Concrete CMS before 9.5.4 re-authorized OAuth REST API requests from the
  bearer token alone and did not re-check the state of the account the token had
  been issued to. The resource server's authorization validator confirmed only
  that a t…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-613
vendor: concretecms
product: concrete_cms
affected:
  - concrete_cms < 9.5.4
patched:
  - concrete_cms 9.5.4
published: '2026-09-16'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:51:12.423'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85387'
references:
  - url: >-
      https://documentation.concretecms.org/developers/introduction/version-history/954-release-notes
    label: ff5b8ace-8b95-4078-9743-eac1ca5451de
tags:
  - nvd
  - cve.org
  - score-dispute
epss: 0.00211
epssPercentile: 0.11578
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T17:32:30.974789Z'
scores:
  nvd: 7.1
  cna: 2
ingestedAt: '2026-09-16T18:01:17.463Z'
---

## Overview

Concrete CMS before 9.5.4 re-authorized OAuth REST API requests from the bearer token alone and did not re-check the state of the account the token had been issued to. The resource server's authorization validator confirmed only that a token existed, had not expired, and had not been explicitly revoked, and deactivating a user did not revoke that user's outstanding tokens. As a result, a deactivated user retained full access to /ccm/api/1.0/* for the remaining lifetime of any token already issued to them. The same gap applied to accounts that had been deleted or locked pending a forced password reset. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.0 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Myq Larson for reporting.

## Affected

- `concrete_cms < 9.5.4`

## Remediation

Upgrade past the affected range:

- `concrete_cms 9.5.4`