Winsage
September 10, 2026
On September 8, 2026, Microsoft released 966 security updates, the largest Patch Tuesday to date, addressing various vulnerabilities. Among these, 105 were classified as critical, including two zero-day vulnerabilities: CVE-2026-81963 and CVE-2026-85880. Both allow authorized local attackers to escalate privileges to SYSTEM level. CVE-2026-81963 is related to the Windows Update Stack, while CVE-2026-85880 involves a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC). The updates included 438 vulnerabilities related to privilege escalation, 258 concerning remote code execution, and 173 involving information disclosures. Users are advised to prioritize the installation of these updates due to the potential exploitation of the two critical vulnerabilities.
