Some Windows 11 users ran into a warning within the Windows Security app claiming that the Local Security Authority LSA was not functioning. The warning appeared as a notification in the app, suggesting that protective measures from the local security center had been disabled and warning that the device could be left exposed to threats even though the system was operating normally.
The issue is linked to a Windows Defender Antivirus update identified as KB5007651, which was released on March 17, 2023. Reports indicate that the error message surfaced for a subset of users shortly after this update went out. Microsoft has begun delivering a fix to the affected devices, but rollout progress has been uneven, with only a portion of users receiving the patch so far.
In the interim, several practical workarounds have emerged. Users can reenable LSA protection by using the Windows Security app, making changes in the registry editor, or by removing the problematic update KB5007651 via Windows Update settings. Each approach is aimed at restoring the protective components of the security stack without waiting for a broader patch deployment.
Public discussions around the issue have involved various outlets and notices. One report noted that Microsoft had been preparing a broader strategy related to security protections and how updates may impact the behavior of Windows Defender and the Local Security Authority. Source attribution for these statements comes from reporting portals that covered the situation as it developed. Source: Windows Latest Portal