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GHSA-x2fp-hj8c-mmxh

Concrete CMS is vulnerable to authorization bypass in the Calendar Event Frontend Dialog

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-8204

Packages

EcosystemPackageAffectedFixed in
Packagist concrete5/concrete5 < 9.5.1 9.5.1

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.