Serious vulnerability threatens tens of thousands of Exchange servers

A serious vulnerability was recently discovered in Exchange Server 2016, Exchange Server 2016, and Exchange Server Subscription Edition (SE). The vulnerability is designated CVE-2026-62911 and can be exploited by hackers to gain full access to affected systems, according to Bleeping Computer . Microsoft has released security patches to address the vulnerability as part of its August 2026 Patch Tuesday release , but there are still 21,899 unpatched servers at risk, according to The Shadowserver F