Tag: cve 2026 62911

Unpatched Microsoft Exchange Servers Exposed to Hijack Attacks

Thousands of Microsoft Exchange servers remain vulnerable to a high-severity flaw, leaving 21,899 internet-facing systems open to hijack attacks that could give attackers control of every mailbox. This unpatched authentication-bypass vulnerability, CVE-2026-62911, was fixed by Microsoft in August, but many servers still haven't been updated.