Microsoft Security Response CenterCVE-2026-81352

Web Media Extensions Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.

Read the vendor bulletin Get alerts for Web Media Extensions on Windows

8.8CVSS out of 10Critical severity

Scope

What the vendor says is affected

Web Media Extensions on Windows 10 Version 21H2 for 32-bit Systems
Web Media Extensions on Windows 10 Version 21H2 for ARM64-based Systems
Web Media Extensions on Windows 10 Version 21H2 for x64-based Systems
Web Media Extensions on Windows 10 Version 22H2 for x64-based Systems
Web Media Extensions on Windows 10 Version 22H2 for ARM64-based Systems
Web Media Extensions on Windows 10 Version 22H2 for 32-bit Systems
Web Media Extensions on Windows 11 Version 25H2 for ARM64-based Systems
Web Media Extensions on Windows 11 Version 25H2 for x64-based Systems
Web Media Extensions on Windows 11 Version 23H2 for ARM64-based Systems
Web Media Extensions on Windows 11 Version 23H2 for x64-based Systems
Web Media Extensions on Windows 11 Version 24H2 for ARM64-based Systems
Web Media Extensions on Windows 11 Version 24H2 for x64-based Systems
Web Media Extensions on Windows 11 version 26H1 for x64-based Systems
Web Media Extensions on Windows 11 Version 26H1 for ARM64-based Systems

Versions the vendor lists as fixed

1.2.42.0
2.1.51.0

Next step

What the vendor recommends

Release Notes

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

Sep 8, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 8, 2026 at 7:15 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Sep 13, 2026 at 2:40 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-81352View CVSS, KEV, EPSS, and threat context

Source

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Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-81352
Last source check: Sep 13, 2026 at 2:40 AM UTC

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Watch Web Media Extensions on Windows

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What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

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