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CVE-2026-50415 is an information disclosure vulnerability residing in the Windows Media framework. The flaw stems from improper access controls and inadequate input validation within the media processing components, allowing an unauthorized, network-adjacent attacker to extract sensitive information without authentication or user interaction. At its core, the vulnerability manifests when Windows Media services fail to properly validate incoming requests or enforce security boundaries during content handling operations. Attackers can leverage malformed media files or crafted network requests to bypass normal access restrictions, potentially triggering buffer over-reads or insecure direct object references within the media pipeline.
The weakness is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) and aligns with MITRE ATT&CK techniques related to credential access and data discovery. The CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, indicating network exploitability, low attack complexity, no privileges required, and no user interaction—making it particularly dangerous for internet-facing systems. Although the confidentiality impact is rated low, the information leaked could include memory contents, system configurations, user credentials, or proprietary media data.
Microsoft has not published a detailed technical explanation of the vulnerable code path or protocol exchange, but the company confirmed the issue and released a fix through the July 2026 cumulative update (KB5101650). The vulnerability affects Windows 10, Windows 11, Windows Server 2019, Windows Server 2022, and Windows Server 2025. While no active exploitation has been confirmed in the wild, the network reachability and lack of authentication elevate the patch priority for administrators. Successful exploitation could aid reconnaissance activities, enabling attackers to map internal infrastructure or harvest data for subsequent attacks.
DailyCVE Form:
Platform: Windows
Version: 10/11/Server 2019-2025
Vulnerability: Info Disclosure (CWE-200)
Severity: Medium (CVSS 5.3)
date: 2026-07-14
Prediction: 2026-07-14 (KB5101650)
What Undercode Say:
Analytics & Detection:
Monitor Windows Media service logs for anomalous inbound requests, especially malformed RTSP/MMS packets or unexpected media file extensions. Use Sysmon or ETW providers to track process creation and network connections originating from wmplayer.exe, WMPNetwk.exe, or `dllhost.exe` hosting the Media Foundation pipeline.
Bash / PowerShell Commands for Assessment:
Check if the July 2026 cumulative update (KB5101650) is installed
Get-HotFix | Where-Object { $_.HotFixID -eq "KB5101650" }
List all Windows Media-related services and their running state
Get-Service -Name Media | Select-Object Name, Status, StartType
Audit firewall rules that allow inbound media streaming ports (e.g., 554, 1755, 5004-5005)
netsh advfirewall firewall show rule name=all | findstr /i "554 1755 5004 5005"
Check for unusual network connections from media processes
netstat -ano | findstr /i "wmplayer.exe WMPNetwk.exe dllhost.exe"
Exploit:
While no public exploit code has been released, the vulnerability can be triggered remotely by sending a crafted RTSP (Real Time Streaming Protocol) request or a malformed ASF (Advanced Systems Format) file to a Windows Media Service endpoint. The attack does not require authentication and can be executed over the network without user interaction. An attacker could use tools like `metasploit` (with a custom module) or a Python script to send a sequence of malformed packets that cause the media parser to leak heap memory contents, potentially exposing sensitive data such as NTLM hashes, local file paths, or active session tokens.
Protection:
- Apply the July 2026 cumulative update (KB5101650) immediately via Windows Update or WSUS.
- Restrict inbound network traffic to Windows Media Services (ports 554, 1755, 5004-5005) using Windows Firewall or network ACLs; allow only trusted IP ranges.
- Disable Windows Media services if not required (e.g.,
Windows Media Player Network Sharing Service,Windows Media Center Receiver Service). - Enable advanced audit policies for object access and process creation to detect exploitation attempts.
- Use network-based intrusion detection signatures that look for anomalous RTSP/MMS packet structures or excessive media protocol errors.
- Segment media servers into isolated VLANs to limit the blast radius of a successful information leak.
Impact:
Successful exploitation leads to the unauthorized disclosure of sensitive information over the network. While the confidentiality impact is rated low (C:L), the leaked data could include memory addresses, internal network topology details, user credentials (if cached), or proprietary media content. This information can be weaponized in subsequent attacks, such as lateral movement, privilege escalation, or targeted social engineering. For organizations subject to compliance frameworks (ISO 27001, PCI DSS), failure to remediate this vulnerability may result in audit findings, regulatory penalties, and reputational damage. Although not a remote code execution flaw, the lack of required authentication and network accessibility make it a high-priority item for patch management.
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Sources:
Reported By: nvd.nist.gov
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