Microsoft has released an advisory for a high-severity security flaw affecting on-premise versions of Exchange Server that could allow an attacker to gain elevated privileges under certain conditions.
The vulnerability, tracked as CVE-2025-53786, carries a CVSS score of 8.0. Dirk-jan Mollema with Outsider Security has been acknowledged for reporting the bug.
“In an Exchange hybrid deployment, an
Microsoft Discloses Exchange Server Flaw Enabling Silent Cloud Access in Hybrid Setups
