Glossary
Extended Security Updates (ESU)
A paid program under which a vendor continues shipping security patches for an operating system or product after its official end of support, typically for a limited number of years. ESU exists because large fleets cannot migrate on schedule; systems without it accumulate unpatched, publicly known vulnerabilities.
Recent coverage mentioning Extended Security Updates (ESU)
Microsoft KB5122878: Critical Windows 10 ESU/LTSC Security Update
Microsoft's KB5122878 delivers crucial security patches for Windows 10 ESU/LTSC, addressing actively exploited zero-days and 966 vulnerabilities.
CVE-2026-62911: Exchange Servers Vulnerable to Mailbox Hijack
Nearly 22,000 Microsoft Exchange Servers remain unpatched against CVE-2026-62911, an auth bypass allowing mailbox hijack attacks.
Windows 10 ESU Extended to 2027: Security Implications
Microsoft extends free Windows 10 Extended Security Updates (ESU) for consumers until October 2027. Understand the security implications and planning for end-of-life.
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