In short
- CVE-2026-8205 is a MEDIUM (CVSS 5.3) vulnerability affecting concrete5/concrete5, concrete cms (concretecms).
- Chance of exploitation in the next 30 days (EPSS): 0.21%, higher than 11.4% of all vulnerabilities.
- Fix: update to 9.5.1 or later.
Description
Concrete CMS 9.5.0 and below is vulnerable to authorization bypass in the Calendar Block since action_get_events does not check canView on the calendar which results in restricted event details being disclosed.
NVD description
Concrete CMS 9.5.0 and below is vulnerable to authorization bypass in the Calendar Block since action_get_events does not check canView on the calendar which results in restricted event details being disclosed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks lalalala5678 for reporting.
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