Patch tracker / CVE reference / CVE-2026-50653

CVE-2026-50653

CVE-2026-50653 is a high severity Microsoft vulnerability with a CVSS score of 7.5. Its EPSS score puts the probability of exploitation in the next 30 days at 64%. 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.

Risk summary

High
7.5
CVSS
64%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 64%. CVSS 7.5 (High).

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

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.

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 64%).
Fixed by KB5099535 and 18 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-2026-50653

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 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.

KB5099535KB5100984KB5100985KB5100989KB5100990KB5100991KB5100998KB5101000KB5101001KB5101002KB5101004KB5101005KB5101006KB5101007KB5101008KB5101009KB5101010KB5101011KB5101014

Scope and sources

Affected products
Fixed by the same updates
CVE-2026-56155CVE-2026-32202CVE-2026-50419CVE-2026-57092CVE-2026-42990CVE-2026-49172CVE-2026-50447CVE-2026-50518
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

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

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.