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CVE-2026-70203

Windows Media Player Remote Code Execution Vulnerability

Published: Sep 8, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-122
8.8HIGH
NVD MITRE
EPSS Score
0.8%
Top 44.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

Heap-based buffer overflow in Windows Media Player allows an unauthorized attacker to execute code over a network.

In plain language

AI Act now

This is a Windows Media Player flaw that can let an attacker run code over the network on unpatched Windows machines; most small businesses should act quickly to install the Microsoft fixes for Windows 10/11 and Windows Server that were affected.

Executive summary

CVE-2026-70203 is a heap-based buffer overflow in Windows Media Player that can be triggered to achieve remote code execution over a network connection without valid credentials.

If affected, business impact
Full device takeoverRansomware riskServer/service disruptionData theft risk

What to do now

  1. Check whether your Windows systems are using Windows Media Player (or have Media Player components/features installed) and confirm their Windows version/build.
  2. Compare each affected machine’s Windows version against the fixed versions listed by Microsoft for CVE-2026-70203.
  3. Install the latest available Windows updates that include the fix for CVE-2026-70203, prioritizing Windows Media Player–capable machines first.
  4. Reboot after updates and verify the machine reports the updated build numbers (the fixed versions below) in Windows Update/System Information.
  5. If you can’t patch immediately, restrict network access to the affected endpoints (limit inbound from untrusted networks) until updates are applied.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122

Affected Products

Microsoft
commercial·US
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows 11 version 23H2On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
and 12 more affected products View all →

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
Is your org exposed to CVE-2026-70203?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70203
msrc.microsoft.com
News mentions
3

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