Patch tracker / CVE reference / CVE-2026-54993
CVE-2026-54993
CVE-2026-54993 is a critical severity Microsoft vulnerability with a CVSS score of 9.9. Microsoft has shipped the fix: deploy one of the 6 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 6 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-2026-54993
CVE-2026-54993 is a Media Foundation remote code execution flaw rated High severity with CVSS 7.8, meaning a crafted media file could run code as the current user rather than requiring network exploitation. It affects Windows 10 Version 1809 (32-bit and x64) and Windows Server 2019, so long-lived servers and older LTSC-style desktops still on 1809 are the exposed population. It is not in CISA KEV and no ransomware use is confirmed, so this is a patch-on-schedule item rather than an emergency, but the media parsing attack surface is easy to trigger through email, browsers, or file shares.
Do this: Deploy the Windows update for the 1809 and Server 2019 builds in your fleet, prioritizing any user-facing hosts that open media or documents from untrusted sources.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-54993
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-54993
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-2026-54993
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 KB5099536, KB5099538, KB5099539, KB5099540, KB5101649, KB5101650 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-2026-54993. 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-2026-54993
Is CVE-2026-54993 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-2026-54993?
Microsoft fixed CVE-2026-54993 in KB5099536, KB5099538, KB5099539, KB5099540, KB5101649, KB5101650. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.
Which products are affected by CVE-2026-54993?
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-2026-54993?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-54993'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-2026-54993, 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.
