CVE-2026-18424 Concrete CMS - Server-Side Request Forgery

Concrete CMS 9.0.0 to 9.5.2 contains a server-side request forgery caused by cross-port reuse of a host's validated DNS pin in remote file import, letting low-privileged authenticated users access internal resources, exploit requires authenticated file import permission.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server-Side Request Forgery
Impact
Server Side Request Forgery, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-918

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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