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Microsoft patches 400+ vulnerabilities, one zero-day under attack (CVE-2026-68820)

Help Net Security
Actively Exploited
WindowsCVEZero-dayMicrosoftExploitVulnerabilityPatchUpdate

Overview

In August 2026, Microsoft released patches addressing over 400 vulnerabilities, including a serious zero-day exploit identified as CVE-2026-68820. This particular flaw is a use-after-free vulnerability affecting the Windows Ancillary Function Driver for WinSock (AFD.sys), which could allow a low-privileged local attacker to gain elevated privileges to the SYSTEM level. This means that attackers with local access could potentially execute malicious applications to take control of affected systems. The urgency of this update is underscored by the fact that the vulnerability is already being exploited in the wild. Users and organizations relying on Windows systems should prioritize applying these updates to mitigate potential risks.

Key Takeaways

  • Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
  • Affected Systems: Windows Ancillary Function Driver for WinSock (AFD.sys)
  • Action Required: Users are advised to apply the August 2026 security patches provided by Microsoft to address this vulnerability.
  • Timeline: Newly disclosed

Original Article Summary

Microsoft’s August 2026 Patch Tuesday delivered security fixes for 400+ vulnerabilities, including one that has been exploited in zero-day attacks (CVE-2026-68820) and three that were publicly disclosed prior to the release of the patches. Vulnerabilities of note CVE-2026-68820 is a use-after-free flaw that affects the Windows Ancillary Function Driver for WinSock (AFD.sys) and allows a low-privileged local attacker to elevate privileges to SYSTEM. “A locally authenticated attacker could run a specially crafted application on an … More → The post Microsoft patches 400+ vulnerabilities, one zero-day under attack (CVE-2026-68820) appeared first on Help Net Security.

Impact

Windows Ancillary Function Driver for WinSock (AFD.sys)

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users are advised to apply the August 2026 security patches provided by Microsoft to address this vulnerability. Specific patch numbers were not mentioned, but users should ensure their systems are up to date with the latest Windows updates.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Windows, CVE, Zero-day, and 5 more.

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