Microsoft October 2026 Patch Tuesday Addresses 1,417 Vulnerabilities with Tenfold Increase

Microsoft's October 2026 Patch Tuesday addressed 1,417 vulnerabilities, with 76 rated critical, representing approximately a tenfold increase from previous releases. Seven critical cloud vulnerabilities required no customer action as Microsoft had already addressed them. One Windows shell security feature bypass vulnerability is already being exploited, allowing attackers to bypass mark-of-the-web warnings, while a .NET framework security feature bypass was publicly disclosed before the patch release. Notable patches include 10 remote code execution vulnerabilities in Windows DHCP server (five critical) and one Exchange Server remote code execution vulnerability that Microsoft considers less likely to be exploited due to requiring detailed environmental knowledge. Ivanti released patches for Connect Secure addressing one actively exploited vulnerability, plus two additional vulnerabilities in Ivanti Neurons affecting patch management and credential security, with Ivanti recommending credential rotation. Adobe patched 110 vulnerabilities across 11 products, with critical issues in Adobe Commerce and ColdFusion including server-side request forgery and unrestricted file upload vulnerabilities rated CVSS 10.0.