Microsoft May 2026 Patch Tuesday fixes 120 flaws, no zero-days

Today is Microsoft’s May 2026 Patch Tuesday, with security updates for 120 flaws and no zero-days disclosed.

This Patch Tuesday addresses 17 “Critical” vulnerabilities, 14 of which are remote code execution, 2 are elevation of privilege, and 1 is an information disclosure flaw.

The number of bugs in each vulnerability category is listed below:

• 61 Elevation of Privilege Vulnerabilities
• 6 Security Feature Bypass Vulnerabilities
• 31 Remote Code Execution Vulnerabilities
• 14 Information Disclosure Vulnerabilities
• 8 Denial of Service Vulnerabilities
• 13 Spoofing Vulnerabilities

When GeekFeed reports on Patch Tuesday security updates, we only count those released by Microsoft today.

Therefore, the number of flaws does not include flaws in Mariner, Azure, Copilot, Microsoft Teams, and Microsoft Partner Center that were fixed by Microsoft earlier this month. There were also 131 Microsoft Edge/Chromium flaws that were fixed by Google this month, which were excluded.

To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5089549 & KB5087420 cumulative updates and the Windows 10 KB5087544 extended security update.

Noteworthy vulnerabilities

Microsoft has not disclosed any zero-day vulnerabilities in this month’s Patch Tuesday. However, there are some vulnerabilities fixed today that IT and security admins should be aware of.

As part of today’s updates, Microsoft has fixed numerous vulnerabilities in Microsoft Office, Word, and Excel that could lead to remote code execution.

These flaws are exploited by opening malicious files, which can result in remote code execution. As many of these can be exploited via the preview pane, it is strongly advised to update Microsoft Office as soon as possible, especially if they commonly receive attachments.

Other interesting vulnerabilities are:

• CVE-2026-35421 – Windows GDI Remote Code Execution Vulnerability: This flaw can be exploited by opening a malicious Enhanced Metafile (EMF) file using Microsoft Paint.
• CVE-2026-40365 – Microsoft SharePoint Server Remote Code Execution Vulnerability: An authenticated attacker can perform a network-based attack that remotely executes code on a SharePoint server.
• CVE-2026-41096 – Windows DNS Client Remote Code Execution Vulnerability: An attacker-controlled DNS server could send a specially crafted DNS response to a vulnerable Windows system, causing the DNS Client to incorrectly process the response and corrupt memory. This would allow the attacker to run code on the vulnerable system remotely.

Recent updates from other companies

Other vendors who released updates or advisories in May 2026 include:

• Adobe has released security updates for After Effects, Premiere Pro, Media Encoder, Commerce, Illustrator, and more.
• AMD disclosed updates for an elevation of privileges vulnerability in the CPU operation (op/µop) cache on Zen 2‑based.
• Apple released security updates for macOS, iOS, watchOS, iPadOS, visionOS, and tvOS. 
• Cisco released security updates for numerous products, including a DoS flaw that requires manual rebooting of affected systems for recovery.
• Fortinet released security updates for two critical flaws in FortiSandbox and FortiAuthenticator.
• Google released Android’s May security bulletin, which fixes 10 vulnerabilities.
• Ivanti released security updates for a high-severity Endpoint Manager Mobile (EPMM) remote code execution vulnerability, which was exploited in zero-day attacks.
• Mozilla released security updates for five Firefox vulnerabilities.
• Palo Alto Networks warned of a critical PAN-OS User-ID Authentication Portal flaw that was exploited in attacks as a zero-day. Patches have still not been released, but mitigations are available.
• SAP released the May security updates, which include fixes for one high-severity and two Critical flaws.
• vm2 released security updates for a critical vulnerability in the popular Node.js sandboxing library.

The May 2026 Patch Tuesday Security Updates

Below is the complete list of resolved vulnerabilities in the May 2026 Patch Tuesday updates.