Question 1

What is the EOL Risk Score for Windows 11 26H1 (E)?

Accepted Answer

Windows 11 26H1 (E) has an EOL Risk Score™ of 50 out of 100, placing it in the Medium risk band. The score is calculated from four factors: EOL Recency (0/40), Attack Surface (30/30), CISA KEV Exposure (20/20), and Extended Support Availability (0/10).

Question 2

Is Windows 11 26H1 (E) still supported?

Accepted Answer

Windows 11 26H1 (E) is currently supported. End of life is scheduled for March 13, 2029. Plan your migration before that date to avoid security risk.

Question 3

When does Windows 11 26H1 (E) reach end of life?

Accepted Answer

Windows 11 26H1 (E) reached (or will reach) end of life on March 13, 2029. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Windows 11 26H1 (E) after end of life?

Accepted Answer

After end of life, the vendor's standard support for Windows 11 26H1 (E) ends, so newly discovered vulnerabilities may never be fixed unless a paid extended support option covers that version. Auditors ask about it too: PCI DSS requirement 12.3.4, for example, calls for a yearly review of vendor end-of-life announcements with a remediation plan approved by senior management.