The Microsoft Security Response Center (MSRC) plays a crucial role in identifying and mitigating vulnerabilities. The Vulnerabilities and Mitigations (V&M) team meticulously reviews submissions from both internal and external security researchers, reproducing issues and assessing their severity. A significant focus for the V&M team is variant hunting, proactively checking other services for similar vulnerabilities to enhance the security of the Microsoft ecosystem. At BlueHat Asia 2025, Senior Security Researchers Cameron Vicent and Brian McNulty shared insights into this variant hunting process. Remarkably, intern Brian McNulty discovered over 22 critical vulnerabilities just two months into his role, showcasing the rapid and effective work being done at Microsoft. This post will highlight Brian’s key findings from the event and provide valuable security tips to help users protect themselves. For anyone engaged in cybersecurity, understanding these processes is vital for staying secure in an evolving threat landscape.
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