Severity: ElevatedAction: Patch

October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)

Microsoft today released patches for 1,417 vulnerabilities. 76 of these vulnerabilities are rated critical, with 7 critical vulnerabiilties requiring no customer actions. One vulnerability was disclosed before today's patch Tuesday, and one is already exploited.

Excerpt from the primary source: SANS Internet Storm Center

Who is affected

Security professionals

What you should do · Patch

Apply the vendor's security update for the affected products. Check the linked advisory for affected and fixed versions, and put internet-facing systems first.

Automated guidance based on this story's classification. Check the linked advisories for specifics.

Sources

We link to original and authoritative sources. Headlines and excerpts belong to their publishers.

Security research

October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th) SANS Internet Storm Center · isc.sans.edu · Oct 13, 2026 · Primary source
Severity: CriticalAction: Act nowExploitation: Exploited

Microsoft October 2026 Patch Tuesday fixes 1,411 flaws, 3 zero-days

Today is Microsoft's October 2026 Patch Tuesday, with security updates addressing a record-breaking 1,411 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.

Why it matters

Source reporting says attackers are already exploiting this, so exposed affected systems are at immediate risk.

Act now

Treat this as an emergency.

Severity: ElevatedAction: Be aware

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Patch

Apply the vendor's security update for the affected products.