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CVE-2026-85387

7.1, high

Concrete CMS Insufficient Session Expiration Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.1, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 16.7% of scored CVEs
Exploitation
No public evidence
Published
16 Sept 2026a month ago

Description

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.

Details

Vendor
Concrete CMS
Product
Concrete CMS
Weakness
CWE-613 (opens in a new tab)
Status
Analyzed
Updated
21 Sept 2026
Assigner
ff5b8ace-8b95-4078-9743-eac1ca5451de

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

References 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Concrete CMS CVEs

Every Concrete CMS CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-85385 Concrete CMS Cross-Site Scripting Vulnerability EPSS 0.5% 9.6, critical
  • CVE-2026-18110 Concrete CMS Missing Authorization Vulnerability EPSS 0.3% 7.5, high
  • CVE-2026-81895 Concrete CMS SQL Injection Vulnerability EPSS 0.5% 7.2, high
  • CVE-2026-18423 Concrete CMS Authorization Bypass Through User-Controlled Key Vulnerability EPSS 0.2% 7.1, high
  • CVE-2026-18424 Concrete CMS Server-Side Request Forgery Vulnerability EPSS 0.2% 7.1, high
  • CVE-2026-18119 Concrete CMS Cross-Site Scripting Vulnerability EPSS 0.3% 9, critical
  • CVE-2026-81901 Concrete CMS Missing Authorization Vulnerability EPSS 0.4% 8.7, high
  • CVE-2026-81902 Concrete CMS Cross-Site Request Forgery Vulnerability EPSS 0.2% 8.1, high

Beyond this page

Is CVE-2026-85387 in your network?

This page tells you how dangerous CVE-2026-85387 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.