CVE-2026-26154

Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

1.1% chance of exploitation in the next 30 days; higher than 64% of CVEs (scores of 2026-10-26)

CWE

CWE-20

Published

2026-04-14

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• microsoft:windows_server_2012
• microsoft:windows_server_2016
• microsoft:windows_server_2019
• microsoft:windows_server_2022
• microsoft:windows_server_2022_23h2
• microsoft:windows_server_2025

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154

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