CVE-2021-26855

CVE-2021-26855 is a security vulnerability in Microsoft Exchange Server that allows attackers to send malicious requests to the server, potentially gaining unauthorized access to email data and internal systems. This flaw acts as part of a broader set of vulnerabilities exploited in the so-called "Exchange Server attack," enabling hackers to execute remote code without needing login credentials. It primarily affects servers exposed to the internet, risking data breaches and system compromise. Microsoft released patches to fix the vulnerability, highlighting the importance of timely updates to protect organizational data and infrastructure.