CVE-2026-81352 - Vulnerability Details

- Web Media Extensions Remote Code Execution Vulnerability

Description

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

Published: 2026-09-08

Score: 8.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The vulnerability is a heap-based buffer overflow in the Microsoft Windows Codecs Library that can be triggered by an attacker who sends specially crafted media data to the Web Media Extensions component. This overflow enables an attacker to execute arbitrary code on the affected system, resulting in full compromise of confidentiality, integrity, and availability.

Affected Systems

Microsoft Web Media Extensions is the affected component. The advisory does not list specific version ranges; as a result, all supported releases of this component are considered vulnerable until a security update is applied.

Risk and Exploitability

The CVSS score of 8.8 indicates a high severity. EPSS data is not available and the vulnerability is not listed in the CISA KEV catalog, but the exploit is feasible over a network connection to the Web Media Extensions service, making it a likely target for attackers, especially when the affected software is exposed to untrusted traffic. Because the flaw is a buffer overflow, bypassing normal input validation, the risk of successful exploitation remains high.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Web Media Extensions

affected

Version	Status	Constraints
`1.0.0.0`	affected	< 1.2.42.0

Configuration 1 [-]

AND

cpe:2.3:a:microsoft:web_media_extensions:*:*:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::x86:*

Configuration 2 [-]

AND

cpe:2.3:a:microsoft:web_media_extensions:*:*:*:*:*:*:*:*

OR	cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*

No data.

Vendor Product Confidence Versions

Microsoft

Web Media Extensions

95%

Version	Status	Scheme	Platform
`[1.0.0.0,1.2.42.0)`	affected	generic	['windows_10_version_21h2_for_32-bit_systems', 'windows_10_version_21h2_for_arm64-based_systems', 'windows_10_version_21h2_for_x64-based_systems', 'windows_10_version_22h2_for_32-bit_systems', 'windows_10_version_22h2_for_arm64-based_systems', 'windows_10_version_22h2_for_x64-based_systems', 'windows_11_version_23h2_for_arm64-based_systems', 'windows_11_version_23h2_for_x64-based_systems', 'windows_11_version_24h2_for_arm64-based_systems', 'windows_11_version_24h2_for_x64-based_systems', 'windows_11_version_25h2_for_arm64-based_systems', 'windows_11_version_25h2_for_x64-based_systems', 'windows_11_version_26h1_for_arm64-based_systems', 'windows_11_version_26h1_for_x64-based_systems']

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Apply the security update released by Microsoft for Web Media Extensions.
Disable or uninstall the Web Media Extensions component if it is not required for business operations.
Configure network and application firewalls to block or restrict traffic that could deliver malicious media to the vulnerable component.
Monitor system logs for signs of buffer overflow attempts or unexpected process behavior.

Generated by OpenCVE AI on September 9, 2026 at 02:48 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0048.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81352

History

Wed, 23 Sep 2026 15:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1
CPEs		cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:* cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:* cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:* cpe:2.3:o:microsoft:windows_10_22h2:::::::x86:* cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*
Vendors & Products		Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1

Wed, 09 Sep 2026 11:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Tue, 08 Sep 2026 17:30:00 +0000

Type	Values Removed	Values Added
Description		Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.
Title		Web Media Extensions Remote Code Execution Vulnerability
First Time appeared		Microsoft Microsoft web Media Extensions
Weaknesses		CWE-122
CPEs		cpe:2.3:a:microsoft:web_media_extensions::::::::
Vendors & Products		Microsoft Microsoft web Media Extensions
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81352
Metrics		cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}`

Subscriptions

Microsoft Web Media Extensions Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-09-08T17:18:50.259Z

Updated: 2026-09-25T21:38:35.719Z

Reserved: 2026-08-26T18:40:19.856Z

Link: CVE-2026-81352

Vulnrichment

Updated: 2026-09-09T09:52:52.804Z

NVD

Status : Analyzed

Published: 2026-09-08T18:20:52.940

Modified: 2026-09-23T15:39:40.480

Link: CVE-2026-81352

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-12T00:15:04Z

Weaknesses

CWE-122
Heap-based Buffer Overflow

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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