CVE-2026-8204

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-13319 GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.10 before… CWE-639
• CVE-2026-111767 MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and… CWE-639
• CVE-2026-105755 vLLM is an inference and serving engine for large language models. CWE-639
• CVE-2026-105754 vLLM is an inference and serving engine for large language models. CWE-639
• CVE-2026-62140 Unauthenticated Insecure Direct Object References (IDOR) in Quiz And Survey Master <=… CWE-639
• CVE-2026-62134 Contributor Insecure Direct Object References (IDOR) in Starter Templates <= 4.7.5… CWE-639
• CVE-2026-62113 Contributor Insecure Direct Object References (IDOR) in Slim SEO <= 4.10.0 versions. CWE-639
• CVE-2026-89264 MoguBlog through 6.2 fails to validate the comment author identity in the POST… CWE-639