Hybrid Identity at Risk: Microsoft Exchange Vulnerability Disclosed at Black Hat 2025
A newly disclosed flaw in on‑prem Microsoft Exchange environments could allow attackers to compromise identity systems and move laterally across environments, without detection. Vulnerability Overview At Black Hat USA 2025, security researcher Dirk‑jan Mollema (Outsider Security) revealed a high‑severity vulnerability affecting hybrid Microsoft Exchange deployments, where on‑prem Exchange connects to Microsoft 365 via Entra ID.The flaw enables attackers […]
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