Microsoft Critical Monthly Updates - 20260514001¶

Overview¶

Microsoft have published their Monthly Updates addressing multiple critical vulnerabilities.

CVE-2026-41089 (Windows Netlogon) now has reports of being actively exploited in the wild.

What is vulnerable?¶

Critical Severity¶

Product(s) Affected and Versions	CVE	CVSS
Vendor listed products and versions	CVE-2026-33117	9.1
Vendor listed products and versions	CVE-2026-40402	9.3
Vendor listed products and versions	CVE-2026-41089	9.8
Vendor listed products and versions	CVE-2026-41096	9.8
Vendor listed products and versions	CVE-2026-41103	9.1
Vendor listed products and versions	CVE-2026-42823	9.9
Vendor listed products and versions	CVE-2026-42833	9.1
Vendor listed products and versions	CVE-2026-42898	9.9

Known Exploitation¶

Product(s) Affected and Versions	CVE	CVSS
Vendor listed products and versions	CVE-2026-41089	9.8

What has been observed?¶

The WASOC has not received any reports of exploitation of this vulnerability on Western Australian Government networks at the time of writing.

Recommendation¶

The WASOC recommends administrators apply the solutions as per vendor instructions to all affected devices within expected timeframes (refer Patch Management):

Microsoft Security Updates: https://msrc.microsoft.com/update-guide/releaseNote/2026-May

Additional References¶

Centre for Cybersecurity Belgium: https://ccb.belgium.be/advisories/warning-microsoft-patch-tuesday-may-2026-patches-118-vulnerabilities-16-critical-102

Changelog¶

2026-05-14: Initial publication.
2026-06-01: Added content relating to claims of active exploitation of CVE-2026-41089.