CVE-2026-62748 in Windows
Summary
by MITRE • 08/11/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Telephony Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a classic race condition flaw within the Windows Telephony Service component that enables local privilege escalation through improper synchronization of shared resources during concurrent execution scenarios. The underlying issue stems from inadequate mutex or semaphore implementation when multiple threads attempt to access critical telephony service resources simultaneously, creating opportunities for malicious code to exploit timing gaps in resource management.
The technical exploitation occurs when an authorized local user leverages the race condition to manipulate shared system resources that the telephony service uses for privilege operations. This flaw typically manifests when the service performs operations on telephony-related objects or registry entries without proper locking mechanisms, allowing concurrent access from multiple execution paths. Attackers can time their malicious code execution to coincide with vulnerable resource access points, potentially manipulating service behavior to escalate privileges.
From a cybersecurity perspective, this vulnerability aligns with CWE-362, which specifically addresses race conditions in concurrent programming where improper synchronization leads to security flaws. The attack vector operates through the local privilege escalation category, representing a significant concern for system administrators and security professionals as it allows attackers who already have legitimate user access to gain higher privileges without requiring additional authentication or exploitation of remote vulnerabilities.
The operational impact extends beyond simple privilege elevation, as compromised telephony services can potentially provide attackers with persistent access vectors and increased attack surface within the Windows environment. This vulnerability particularly affects systems where telephony services are actively running and where local users have legitimate access to system resources that could be leveraged for further compromise.
Mitigation strategies should focus on implementing proper synchronization mechanisms throughout the telephony service codebase, including appropriate mutex usage, atomic operations, and careful resource management protocols. System administrators should ensure timely patch deployment through Microsoft security updates, maintain strict access controls, and monitor for unusual telephony service behavior that might indicate exploitation attempts. The solution architecture must incorporate robust concurrent programming practices to prevent similar vulnerabilities from emerging in future implementations of Windows telephony services and related components.
Organizations should consider implementing the principle of least privilege and conduct regular security assessments of system services that handle sensitive operations. This vulnerability demonstrates the critical importance of proper concurrency control in system-level services, aligning with ATT&CK technique T1068 which covers local privilege escalation through various system weaknesses including improper synchronization mechanisms.