---
title: "CVE-2026-85387: Concrete CMS - Broken Access Control"
description: "Concrete CMS < 9.5.4 contains a broken access control vulnerability caused by re-authorizing OAuth REST API requests based solely on bearer tokens without re-checking account state, letting attackers with valid tokens access API endpoints despite user deactivation, deletion, or lockout, exploit requires valid bearer token."
url: https://panop.io/threat-heartbeat/CVE-2026-85387/
---

# CVE-2026-85387 Concrete CMS - Broken Access Control

Concrete CMS < 9.5.4 contains a broken access control vulnerability caused by re-authorizing OAuth REST API requests based solely on bearer tokens without re-checking account state, letting attackers with valid tokens access API endpoints despite user deactivation, deletion, or lockout, exploit requires valid bearer token.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.26% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-85387)

## Details

Type

Broken Access Control

Impact

Broken Access Control

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-613](https://cwe.mitre.org/data/definitions/613.html)

## Vendor fix

Update to version 9.5.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-85387](https://nvd.nist.gov/vuln/detail/CVE-2026-85387)
- [https://documentation.concretecms.org/developers/introduction/version-history/954-release-notes](https://documentation.concretecms.org/developers/introduction/version-history/954-release-notes)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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