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 ↗

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

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

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