https://www.bleepingcomputer.com/news/microsoft/microsoft-defender-update-behind-windows-lsa-protection-warnings/

Microsoft says the KB5007651 Microsoft Defender Antivirus update triggers Windows Security warnings on Windows 11 systems saying that Local Security Authority (LSA) Protection is off.

LSA Protection is a security feature that defends sensitive information like credentials from theft by blocking untrusted LSA code injection and process memory dumping.