Patch tracker / CVE reference / CVE-2026-50653
CVE-2026-50653
CVE-2026-50653 is a critical severity Microsoft vulnerability with a CVSS score of 9.9. Microsoft has shipped the fix: deploy one of the 19 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Critical severity Microsoft vulnerability, CVSS 9.9. Fixed by 19 Microsoft security updates.
Risk summary
Updated July 23, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-50653
CVE-2026-50653 is a High severity (CVSS 7.5) denial of service flaw in Azure Active Directory, with the affected component list also naming .NET Framework 3.5 on Windows 11 version 26H1 for ARM64 and x64 systems. Because it targets an identity service, a successful DoS can block authentication for every application and user that depends on Entra ID, not just one server. It is not listed in CISA KEV and has no known ransomware association, so this is patch on schedule rather than emergency response.
Do this: Apply the Windows 11 version 26H1 .NET Framework 3.5 update to your ARM64 and x64 hosts and confirm your Azure AD tenant is on the fixed service build.
AI-generated from public data, 2026-07-22. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-50653
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-50653
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
Exploitation and severity
Not in the CISA KEV catalog. EPSS exploit probability 7.5%. CVSS 9.9 (Critical).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
Official patch(es) for CVE-2026-50653
Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. 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 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-2026-50653. 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.
Affected products
Common questions about CVE-2026-50653
Is CVE-2026-50653 actively exploited?
It is not currently listed in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score puts the probability of exploitation in the next 30 days at 7.5%.
What patch fixes CVE-2026-50653?
Microsoft fixed CVE-2026-50653 in KB5099535, KB5100984, KB5100985, KB5100989, KB5100990, KB5100991, KB5100998, KB5101000, KB5101001, KB5101002, KB5101004, KB5101005, KB5101006, KB5101007, KB5101008, KB5101009, KB5101010, KB5101011, KB5101014. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.
Which products are affected by CVE-2026-50653?
.NET 10.0 installed on Windows, .NET 8.0 installed on Mac OS, .NET 8.0 installed on Windows, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019.
Can I ask my own AI about CVE-2026-50653?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-50653's key facts: severity, CVSS, EPSS exploit probability, CISA KEV status, and the fixing KB. Copy it into Claude, ChatGPT, or Copilot for a triage plan; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).
Fixed by the same updates
If you are patching CVE-2026-50653, the same updates also fix these:
Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.
