Patch tracker / CVE reference / CVE-2026-20929

CVE-2026-20929

CVE-2026-20929 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.5 (High). Microsoft has shipped the fix: deploy one of the 12 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.

Microsoft rates it Important. CVSS 7.5 (High). Fixed by 12 Microsoft security updates.

Senserva AI read on CVE-2026-20929Official patches for CVE-2026-20929Change historyAdmin questions

Risk summary

High
7.5
CVSS v3
2.9%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 2.9%. CVSS 7.5 (High).

This CVE is among the top 5% of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-20929

An elevation of privilege flaw in HTTP.sys rated Critical at CVSS 9.8 with a 73 percent exploit probability, hitting Windows 10 1809 and Windows Server 2019. Where the companion HTTP.sys bugs this cycle crash the service, this one moves an attacker up the privilege ladder on web servers, turning a compromised low-privilege app pool into kernel-adjacent control. IIS boxes that host anything internet-facing are the priority surface.

Do this: Patch Server 2019 IIS servers hosting public sites first, then internal web hosts.

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

Schedule normally
No exploitation observed as of 2026-11-03: not in the CISA KEV catalog, EPSS 3%.
Fixed by KB5073450 and 11 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Deploy with your normal update cycle. This page refreshes daily; the verdict changes the day the data does.
Senserva AI Opinion and rich prompt for CVE-2026-20929

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

Official patch(es) for CVE-2026-20929

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5073450, KB5073455, KB5073457, KB5073695, KB5073696, KB5073697, KB5073698, KB5073699, KB5073700, KB5073722, KB5073723, KB5073724 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-2026-20929. 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.

KB5073450KB5073455KB5073457KB5073695KB5073696KB5073697KB5073698KB5073699KB5073700KB5073722KB5073723KB5073724

Scope and sources

Affected products
Fixed by the same updates
CVE-2026-20805CVE-2025-6965CVE-2026-20868CVE-2026-20856CVE-2026-20931CVE-2023-31096CVE-2024-55414CVE-2026-20809
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.
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