Microsoft security advisory – August 2026 monthly rollup (AV26-804) – Update 4
Cybersecurity Classified by Officially
Serial Number: AV26-804
Date: August 11, 2026
Updated:September 25, 2026
As of August 11, 2026, Microsoft is affected by vulnerabilities in the following products:
The Cyber Centre encourages users and administrators to review the web link provided, perform the suggested mitigations, and apply the necessary updates.
On August 18, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-33824 and CVE-2026-55040 to their Known Exploited Vulnerabilities (KEV) Database.
Open-source reporting indicates that CVE-2026-63520 related to Microsoft SharePoint Server is being exploited in the wild.
Open-source reporting indicates that CVE-2026-65660 related to Microsoft SharePoint Server is being exploited in the wild.
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https://cyber.gc.ca/en/alerts-advisories/microsoft-security-advisory-august-2026-monthl...