Understanding the 'SearchLeak' Vulnerability in Microsoft 365 Copilot (CVE-2026-42824)
In June 2026, a critical vulnerability known as 'SearchLeak' (CVE-2026-42824) was discovered in Microsoft 365 Copilot. This flaw allowed attackers to craft malicious links that, when accessed by a user, could exfiltrate sensitive data such as emails, meeting notes, and documents from OneDrive and SharePoint. The attack exploited a parameter-to-prompt injection (P2P) technique, enabling unauthorized data disclosure over the network. Microsoft promptly addressed the issue by releasing a patch to mitigate the vulnerability. The 'SearchLeak' incident underscores the evolving nature of AI-driven cyber threats, particularly those targeting large language model (LLM) systems integrated into enterprise environments. It highlights the necessity for organizations to implement robust security measures, including prompt isolation and output sanitization, to protect against sophisticated prompt-injection attacks.
Kill Chain