Patch tracker / CVE reference / CVE-2026-50646

CVE-2026-50646

CVE-2026-50646 is a high severity Microsoft vulnerability with a CVSS score of 7.8. Its EPSS score puts the probability of exploitation in the next 30 days at 64%. Microsoft has shipped the fix: deploy one of the 21 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

7.8

CVSS

64%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 64%. CVSS 7.8 (High).

This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-50646

This is a Critical (CVSS 9.9) remote code execution flaw in .NET Framework, spanning versions 3.5 and 4.8 across Windows Server 2012, Windows Server 2016 Server Core, and Windows 10 Version 1809. The unusually high CVSS score paired with a modest 7 percent EPSS means the flaw is severe in impact but not yet showing broad exploitation, and it is not in CISA KEV. Because .NET is a base runtime rather than a discrete app, exposure includes any managed service or web application built on these framework versions.

Do this: Deploy the Microsoft .NET Framework updates to your Server 2012, Server 2016 Core, and Windows 10 1809 hosts, prioritizing internet-facing systems running managed workloads.

AI-generated from public data, 2026-07-24. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-50646

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I am an IT admin assessing a vulnerability. Facts for CVE-2026-50646 (source: https://senserva.com/cve/CVE-2026-50646.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2026-50646: High severity Microsoft vulnerability, CVSS 7.8
- EPSS 30-day exploitation probability: 64%
- Actively exploited (CISA KEV): no
- Fixed by: KB5099535, KB5100984, KB5100985, KB5100989, KB5100990, KB5100991, KB5100998, KB5101000, KB5101001, KB5101002, KB5101004, KB5101005, KB5101006, KB5101007, KB5101008, KB5101009, KB5101010, KB5101011, KB5101014, KB5104032, KB5104033
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch this cycle

Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 64%).

Fixed by KB5099535 and 20 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2026-50646

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5099535, KB5100984, KB5100985, KB5100989, KB5100990, KB5100991, KB5100998, KB5101000, KB5101001, KB5101002, KB5101004, KB5101005, KB5101006, KB5101007, KB5101008, KB5101009, KB5101010, KB5101011, KB5101014, KB5104032, KB5104033 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2026-50646. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5099535 KB5100984 KB5100985 KB5100989 KB5100990 KB5100991 KB5100998 KB5101000 KB5101001 KB5101002 KB5101004 KB5101005 KB5101006 KB5101007 KB5101008 KB5101009 KB5101010 KB5101011 KB5101014 KB5104032 KB5104033

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.

CVE-2026-50646

Risk summary

Official patch(es) for CVE-2026-50646

Scope and sources