A critical vulnerability in Microsoft Excel enables attackers to exploit the Copilot Agent for zero-click information disclosure, potentially exposing sensitive personal and financial data. This bug is particularly concerning as it can be leveraged without any user interaction, making it a significant threat to organizations. The vulnerability is one of 83 CVEs released by Microsoft, with two being publicly known, although none are currently under active exploitation. The lack of active exploitation provides a brief window for system administrators to assess their exposure and apply patches before attackers can develop exploits. The vulnerability highlights the importance of prompt patching, as zero-day activity targeting Microsoft products can quickly lead to widespread exploitation. This vulnerability matters to practitioners because it underscores the need for immediate action to mitigate potential attacks, as the window for patching is already closing1.