Microsoft Exchange Server Vulnerabilities Enable DoS, Privilege Escalation, and RCE Attacks

Microsoft has released security updates for multiple Exchange Server vulnerabilities that could allow denial-of-service, privilege escalation, remote code execution, spoofing, and security feature bypass attacks. The flaws were disclosed on August 11, 2026, as part of Microsoft’s monthly Patch Tuesday release. Exchange Server Subscription Edition, Exchange Server 2019, and Exchange Server 2016 are among the supported products receiving security updates. The most serious issue is CVE-2026-62911, a critical elevation-of-privileges vulnerability with a CVSS score of 8.0. The flaw is linked to CWE-294, known as authentication bypass by capture-replay. An attacker with low privileges could exploit the issue over a network if they can...

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