cve 2026 49783

The cve 2026 49783 tag covers Microsoft’s fix for an Important-rated Secure Boot security feature bypass in supported Windows 10, Windows 11, and Windows Server releases. The vulnerability results from an improperly implemented security check and could allow an authorized attacker to bypass Secure Boot protections locally. Microsoft addressed the issue in its July 14, 2026 security updates. Coverage focuses on the vulnerability’s CVSS 3.1 base score of 7.8 and the need to prioritize updates on systems where boot-chain integrity is important, including BitLocker-protected endpoints, privileged workstations, virtualization hosts, and servers exposed to untrusted local users.