CVE-2026-81902 Concrete CMS - Cross-Site Request Forgery

Concrete CMS 9 through 9.5.2 contains a cross-site request forgery caused by missing CSRF token validation in the orphaned block removal panel action, letting remote attackers delete page blocks via an authenticated user with edit permissions.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Cross-Site Request Forgery
Impact
Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-352

Vendor fix

Update to Concrete CMS 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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