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CVE-2026-8204
Published: May 21, 2026
Modified: May 22, 2026
PUBLISHED
Description
Concrete CMS 9.5.0 and below is vulnerable to authorization Bypass in the Calendar Event Frontend Dialog which can allow cross-calendar data disclosure. A public calendar block can be used as a pivot point to access private calendar data. 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 Winston Crooker for reporting.
| Vendor | Product | Versions |
|---|---|---|
Concrete CMS | Concrete CMS | affected 5 - <= 9.5.0 |
Weaknesses (CWE)
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