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CVE-2026-8238 Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/message_page' allowing unauthenticated read of any conversation message

🗓️ 21 May 2026 21:04:50Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 1 Views

Concrete CMS 9.5.0 and earlier allows unauthenticated access to messages via message_page, exposing content and attachments.

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