CVE-2026-18423 Concrete CMS - Broken Access Control

Concrete CMS 9.0.0 through 9.5.2 contains an insecure direct object reference (IDOR) caused by improper access control in Express saved search preset delete and edit dialogs, letting authenticated users with view permission delete or rename presets without proper authorization.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.25% 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:N/I:L/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-639

Vendor fix

Update to a version later than 9.5.2 or the latest available version.

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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