CVE-2026-68526CWE-352csrf

CVE-2026-68526

Medium · published September 12, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
1.3
In the wild
Unconfirmed
What it is

Concrete CMS before 9.5.3 did not validate an anti-CSRF token in the Calendar event duplicate dialog controller (concrete/controllers/dialog/event/duplicate.php) submit() action, which duplicated a calendar event after checking only canAccess() and the per-resource canAddCalendarEvent() permission, so a crafted cross-site request could cause an authenticated user with add-event permission to create duplicate CalendarEvents and CalendarEventVersions records under their own authority. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00112 · 1.3th percentile
Weakness
CWE-352 · Cross-Site Request Forgery (CSRF)
Published
2026-09-12T00:17Z
Affected products (1)
ProductVersionsFixed in
concretecms/concrete_cms< 9.5.39.5.3
References (1)
https://documentation.concretecms.org/9-x/developers/introduction/version-history/953-release-notes · ff5b8ace-8b95-4078-9743-eac1ca5451de
EPSS history
Timeline
  • 13 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 11 SEP 19:35Z
    Concrete CMS before 9.5.3 is vulnerable to CSRF in the Calendar event duplicate dialog controller
    cvelistv5