CVE-2026-8204
- Source
- https://cve.org/CVERecord?id=CVE-2026-8204
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8204.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-8204
- Aliases
- Published
- 2026-05-21T20:56:33.018Z
- Modified
- 2026-07-15T01:48:53.264207185Z
- Severity
-
- 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
- Summary
- Concrete CMS 9.5.0 and below is vulnerable to Authorization Bypass in the Calendar Event Frontend Dialog
- Details
-
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.
- Database specific
{ "cwe_ids": [ "CWE-639" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8204.json", "cna_assigner": "ConcreteCMS" }- References
Affected packages
Git / github.com/concretecms/concretecms
Affected ranges
- Type
- GIT
- Repo
- https://github.com/concretecms/concretecms
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "cpe": "cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "5" }, { "last_affected": "9.5.0" }, { "introduced": "0" }, { "fixed": "9.5.1" } ], "source": [ "AFFECTED_FIELD", "CPE_RANGE" ] }