Microsoft addressed 165 vulnerabilities affecting its various products and underlying systems, including one actively exploited vulnerability in Microsoft Office SharePoint, in this month’s Patch Tuesday update. 

“By my count, this is the second-largest monthly release in Microsoft’s history,” Dustin Childs, head of threat awareness at Trend Micro’s Zero Day Initiative, wrote in a blog post Tuesday.

Microsoft didn’t explain why its monthly batch of patches grew so large this month, but Childs noted that many vulnerability programs are experiencing a significant increase in submissions found by artificial intelligence tools. “For us, our incoming rate has essentially tripled, making triage a challenge, to say the least,” he added. 

The zero-day vulnerability — CVE-2026-32201 — has a CVSS rating of 6.5 and allows attackers to view sensitive information and make changes to disclosed information. Microsoft said the improper input validation defect in Microsoft Office SharePoint allows unauthenticated attackers to perform spoofing over a network.

The Cybersecurity and Infrastructure Security Agency added the zero-day to its known exploited vulnerabilities catalog shortly after Microsoft’s disclosure. 

Microsoft also addressed a high-severity vulnerability — CVE-2026-33825 — that was publicly known at the time of release. The vendor said the defect in Microsoft Defender is more likely to be exploited and could allow unauthorized attackers to elevate privileges locally.

“What starts as a foothold can quickly become full system domination,” Jack Bicer, director of vulnerability research at Action1, said in a blog post about the vulnerability. 

“Once exploited, it allows full control over endpoints, enabling data exfiltration, disabling security tools and lateral movement across networks,” Bicer said.

Proof-of-concept exploit code for the defect is publicly available, which increases the likelihood of exploitation in the wild, he added.

Microsoft disclosed two critical vulnerabilities this month — CVE-2026-33824 affecting Windows IKE Extension and CVE-2026-26149 affecting Microsoft Power Apps — but designated both of the defects as less likely to be exploited.

More than three-quarters of the vulnerabilities disclosed this month are less likely to be exploited, according to Microsoft. Meanwhile, the company designated 19 vulnerabilities as more likely to be exploited.

The full list of vulnerabilities addressed this month is available in Microsoft’s Security Response Center.

The post Microsoft drops its second-largest monthly batch of defects on record appeared first on CyberScoop.

Microsoft this week pushed security updates to fix more than 60 vulnerabilities in its Windows operating systems and supported software, including at least one zero-day bug that is already being exploited. Microsoft also fixed a glitch that prevented some Windows 10 users from taking advantage of an extra year of security updates, which is nice because the zero-day flaw and other critical weaknesses affect all versions of Windows, including Windows 10.

Affected products this month include the Windows OS, Office, SharePoint, SQL Server, Visual Studio, GitHub Copilot, and Azure Monitor Agent. The zero-day threat concerns a memory corruption bug deep in the Windows innards called CVE-2025-62215. Despite the flaw’s zero-day status, Microsoft has assigned it an “important” rating rather than critical, because exploiting it requires an attacker to already have access to the target’s device.

“These types of vulnerabilities are often exploited as part of a more complex attack chain,” said Johannes Ullrich, dean of research for the SANS Technology Institute. “However, exploiting this specific vulnerability is likely to be relatively straightforward, given the existence of prior similar vulnerabilities.”

Ben McCarthy, lead cybersecurity engineer at Immersive, called attention to CVE-2025-60274, a critical weakness in a core Windows graphic component (GDI+) that is used by a massive number of applications, including Microsoft Office, web servers processing images, and countless third-party applications.

“The patch for this should be an organization’s highest priority,” McCarthy said. “While Microsoft assesses this as ‘Exploitation Less Likely,’ a 9.8-rated flaw in a ubiquitous library like GDI+ is a critical risk.”

Microsoft patched a critical bug in Office — CVE-2025-62199 — that can lead to remote code execution on a Windows system. Alex Vovk, CEO and co-founder of Action1, said this Office flaw is a high priority because it is low complexity, needs no privileges, and can be exploited just by viewing a booby-trapped message in the Preview Pane.

Many of the more concerning bugs addressed by Microsoft this month affect Windows 10, an operating system that Microsoft officially ceased supporting with patches last month. As that deadline rolled around, however, Microsoft began offering Windows 10 users an extra year of free updates, so long as they register their PC to an active Microsoft account.

Judging from the comments on last month’s Patch Tuesday post, that registration worked for a lot of Windows 10 users, but some readers reported the option for an extra year of updates was never offered. Nick Carroll, cyber incident response manager at Nightwing, notes that Microsoft has recently released an out-of-band update to address issues when trying to enroll in the Windows 10 Consumer Extended Security Update program.

“If you plan to participate in the program, make sure you update and install KB5071959 to address the enrollment issues,” Carroll said. “After that is installed, users should be able to install other updates such as today’s KB5068781 which is the latest update to Windows 10.”

Chris Goettl at Ivanti notes that in addition to Microsoft updates today, third-party updates from Adobe and Mozilla have already been released. Also, an update for Google Chrome is expected soon, which means Edge will also be in need of its own update.

The SANS Internet Storm Center has a clickable breakdown of each individual fix from Microsoft, indexed by severity and CVSS score. Enterprise Windows admins involved in testing patches before rolling them out should keep an eye on askwoody.com, which often has the skinny on any updates gone awry.

As always, please don’t neglect to back up your data (if not your entire system) at regular intervals, and feel free to sound off in the comments if you experience problems installing any of these fixes.

[Author’s note: This post was intended to appear on the homepage on Tuesday, Nov. 11. I’m still not sure how it happened, but somehow this story failed to publish that day. My apologies for the oversight.]