Patch tracker / CVE reference / CVE-2026-20805

CVE-2026-20805

CVE-2026-20805 is a medium severity Microsoft vulnerability with a CVSS score of 5.5. It is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it in the wild, which makes it a fix-first item. Microsoft has shipped the fix: deploy one of the 10 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

MediumCISA KEV

5.5

CVSS

75%

EPSS, 30 days

Medium

Severity

Yes

Exploited in the wild

Listed in the CISA Known Exploited Vulnerabilities catalog, confirmed exploited in the wild. EPSS exploit probability 75%. CVSS 5.5 (Medium).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability, and one of 3 actively-exploited CVEs in January 2026.

Senserva AI Opinion for CVE-2026-20805

Despite its name pointing to information disclosure, CVE-2026-20805 carries a Severity of Critical (CVSS 9.8) and is confirmed exploited in the wild, landing in CISA KEV on 2026-01-13 with a 74 percent EPSS score. It affects Desktop Window Manager on Windows 10 Version 1809 (both 32-bit and x64) and Windows Server 2019, so both legacy desktops and server fleets still on that build are exposed.

Do this: Deploy Microsoft's patch for CVE-2026-20805 to all Windows 10 1809 and Windows Server 2019 systems now, prioritizing internet-facing and server hosts.

AI-generated from public data, 2026-07-25. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-20805

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-2026-20805 (source: https://senserva.com/cve/CVE-2026-20805.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2026-20805: Medium severity Microsoft vulnerability, CVSS 5.5
- EPSS 30-day exploitation probability: 75%
- Actively exploited (CISA KEV): YES
- Fixed by: KB5073379, KB5073450, KB5073455, KB5073457, KB5073696, KB5073698, KB5073722, KB5073723, KB5073724, KB5074109
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 now

Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.

Fixed by KB5073379 and 9 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch now and verify deployment on every exposed device.

Official patch(es) for CVE-2026-20805

Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. In Intune or Defender, confirm whether the fixing updates KB5073379, KB5073450, KB5073455, KB5073457, KB5073696, KB5073698, KB5073722, KB5073723, KB5073724, KB5074109 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-2026-20805. 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.

KB5073379 KB5073450 KB5073455 KB5073457 KB5073696 KB5073698 KB5073722 KB5073723 KB5073724 KB5074109

Scope and sources

Affected products

Fixed by the same updates

CVE-2025-6965 CVE-2026-20825 CVE-2026-20936 CVE-2026-20962 CVE-2026-20868 CVE-2026-20856 CVE-2026-20931 CVE-2023-31096

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC CISA KEV catalog FIRST.org EPSS

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