# CVE-2026-8205

## Summary

- **CVE ID:** CVE-2026-8205
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (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)
- **CWE:** CWE-425
- **Published:** May 21, 2026
- **Last Modified:** May 22, 2026

## 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.

## Affected Products

- Concrete CMS — Concrete CMS (5.0)

## References

- [CNA](https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 11.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._