CISA ordered federal agencies to immediately investigate, patch or disconnect their systems from Microsoft Exchange Server, due to a discovered vulnerability exploited by Chinese hackers. NGO using Microsoft Exchange Server should immediately take action to prevent data breach and other serious security issue.
For details, please refer to the below link:
https://thehill.com/policy/cybersecurity/541489-federal-agencies-ordered-to-patch-systems-after-microsoft-finds-security?web_view=true&rl=1