EUVD-2026-43784
GHSA-2hrf-rjx4-42g9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local vector and low privilege align with 'authorized local attacker' in the description; C:H reflects meaningful disclosure while I:N and A:N match the pure information disclosure nature with no modification or disruption of service.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Exposure of sensitive information to an unauthorized actor in Windows Audio Service allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Audio Service on multiple Windows desktop and server versions improperly exposes sensitive information to locally authenticated standard users, enabling information disclosure without requiring elevated privileges. Affecting Windows 10 1809 through Windows 11 26H1 and Windows Server 2019 (with Server 2022 and 2025 referenced in tags), the flaw is exploitable post-foothold by any low-privileged local account, making it a realistic post-exploitation pivot rather than an initial access vector. No public exploit code has been identified at time of analysis, and a vendor-released patch is confirmed available via the Microsoft Security Response Center.
Technical ContextAI
Windows Audio Service (AudioSrv) is a core Windows system service managing audio device enumeration, stream routing, and session management, running by default on both desktop and server SKUs. The root cause is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating the service returns, leaks, or otherwise makes accessible data - potentially via IPC mechanisms, shared memory, named pipes, or COM interfaces - to a caller with insufficient privilege to legitimately access that data. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) confirms: exploitation is local-only, requires no complex conditions, needs only a standard low-privileged account, involves no user interaction, and is scoped entirely within the audio service's security boundary. The high confidentiality impact (C:H) suggests meaningful data is reachable, though the specific nature of the disclosed information is not detailed in available data. CPE strings confirm affected product lines spanning cpe:2.3:a:microsoft:windows_10_version_1809 through cpe:2.3:a:microsoft:windows_11_version_26h1 and cpe:2.3:a:microsoft:windows_server_2019.
RemediationAI
Apply the vendor-released patch available through the Microsoft Security Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34328. An exact patched build number was not included in the provided intelligence data - consult the MSRC advisory directly for the specific KB article and version applicable to each affected SKU. Ensure Windows Update is fully current across all affected systems spanning Windows 10 1809 through Windows 11 26H1 and the applicable Windows Server versions. As a compensating control pending patch deployment, restrict local interactive and remote desktop logon rights to the minimum required user set via Group Policy (User Rights Assignment: 'Allow log on locally' and 'Allow log on through Remote Desktop Services'), reducing the pool of accounts capable of triggering the disclosure. If the Windows Audio Service is genuinely unused on a given server system (e.g., headless servers with no audio requirement), disabling the service via Group Policy or sc.exe config audiosrv start=disabled removes the attack surface entirely, with the trade-off of disabling all audio functionality for that host.
More in Windows Server 2019
View allWindows MSHTML component contains a remote code execution vulnerability that allows attackers to craft malicious ActiveX
<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged fi
Windows MSDT (Microsoft Support Diagnostic Tool) allows remote code execution when called via the ms-msdt URL protocol f
Windows Win32k contains an out-of-bounds write vulnerability enabling local privilege escalation to SYSTEM, exploited by
Windows Print Spooler Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no auth
Windows Search Remote Code Execution Vulnerability. Rated high severity (CVSS 7.5), this vulnerability is remotely explo
Internet Shortcut Files Security Feature Bypass Vulnerability. Rated high severity (CVSS 8.1), this vulnerability is rem
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Windows Kernel contains a TOCTOU race condition vulnerability allowing local privilege escalation, exploited by the OilR
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
Active Directory Domain Services Elevation of Privilege Vulnerability. Rated high severity (CVSS 7.5), this vulnerabilit
Windows Internet Shortcut Files (.url) contain an external control vulnerability (CVE-2025-33053, CVSS 8.8) that enables
Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today