secure boot trust

Secure boot trust refers to the chain of trust established by UEFI Secure Boot, which ensures that only signed, trusted bootloaders and drivers execute during system startup. Discussions on WindowsForum.com highlight how vulnerabilities like CVE-2025-48804 can undermine this trust, particularly in TPM-only BitLocker deployments. The BitUnlocker proof-of-concept demonstrates that physical access combined with a downgrade attack can bypass secure boot protections, allowing attackers to boot a manipulated Windows recovery environment and access encrypted drives. Microsoft has patched the underlying bug, but the incident underscores that secure boot trust is not absolute and requires careful management of boot configuration and recovery policies to maintain security. Administrators are advised to review their boot trust settings and consider additional protections like PIN or key-based BitLocker unlock.