CISA Alerts on Exploitation of Windows Ancillary Function Vulnerability CVE-2026-68820

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has warned of active exploitation of a Microsoft Windows vulnerability, CVE-2026-68820, which is a use-after-free flaw in the Windows Ancillary Function Driver for WinSock. This vulnerability allows an authorized attacker to elevate privileges locally. CISA added the vulnerability to its Known Exploited Vulnerabilities Catalog on August 11, 2026. The first public proof of concept (PoC) was released on August 13, 2026. Organizations using affected Windows systems are at risk, and immediate action is recommended to mitigate potential attacks. The vulnerability highlights the ongoing challenges in securing Windows environments against privilege escalation attacks.

Key Points: • CVE-2026-68820 is a use-after-free vulnerability in Windows Ancillary Function Driver. • CISA added the vulnerability to its Known Exploited Vulnerabilities Catalog on August 11, 2026. • The first public proof of concept for CVE-2026-68820 was released on August 13, 2026.