CVE-2026-8205
Concrete CMS is vulnerable to authorization bypass in the Calendar Block
5.3
MEDIUM
CVSS 3.1
EPSS 0.21%
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.
How to fix CVE-2026-8205
To remediate CVE-2026-8205, upgrade the affected package to a fixed version below.
- —upgrade to 9.5.1 or later
Is CVE-2026-8205 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 9.5.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |