‘High-Severity’ Microsoft Exchange Vulnerability Disclosed on Heels of Black Hat Talk

Microsoft warns of high-severity flaw in hybrid Exchange deployments

Microsoft has warned customers to mitigate a high-severity vulnerability in Exchange Server hybrid deployments that could allow attackers to escalate privileges in Exchange Online cloud environments undetected.

‘High-severity’ Microsoft Exchange vulnerability disclosed on heels of Black Hat talk

Parts of the federal enterprise are likely susceptible to the flaw that allows hackers to hijack on-premises versions of Active Directory. CISA plans to...

CISA, Microsoft issue alerts on ‘high-severity’ Exchange vulnerability

Organizations with on-premises Microsoft Exchange servers are being urged to take steps to reduce exposure to a vulnerability recently reported by a researcher.

Exchange Web Services Changes Coming By Oct 2025 - Cybernoz - Cybersecurity News

Organizations using Exchange hybrid deployments should prepare for new changes taking effect over the next few months. Microsoft has announced that beginning in August 2025, it will temporarily block Exchange Web Services (EWS) traffic that uses the Exchange Online shared service principal in certain hybrid environments.   The change primarily impacts organizations using “rich coexistence” features such as free/busy calendar lookups, MailTips, a…

Exchange Web Services Changes Coming By Oct 2025

Organizations using Exchange hybrid deployments should prepare for new changes taking effect over the next few months. Microsoft has announced that beginning in August 2025, it will temporarily block Exchange Web Services (EWS) traffic that uses the Exchange Online shared service principal in certain hybrid environments.   The change primarily impacts organizations using "rich coexistence" features such as free/busy calendar lookups, MailTips, a…