Microsoft Exchange Vulnerability CVE-2026-62911: What Administrators Should Do and How Zscaler Can Help

Microsoft's August 2026 Patch Tuesday included a fix for CVE-2026-62911, a high-severity authentication bypass vulnerability affecting Exchange Server 2016, 2019, and Subscription Edition. The severity has a CVSS score of 8.0 from Microsoft. As of September 1, threat intelligence group Shadowserver has identified around 22,000 Exchange servers that remain unpatched and exposed to the int