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, Windows 11 26H1 (E) no longer receives security patches. Any newly discovered CVEs remain unpatched indefinitely. Organizations running EOL software also face compliance violations under SOC 2, PCI DSS, HIPAA, and ISO 27001, which require use of supported software versions.