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Microsoft patches SearchLeak vulnerability in Copilot for Microsoft 365

Feeds.4Sysops •IT News • June 16, 2026

Microsoft has addressed a critical vulnerability chain in Copilot for Microsoft 365 that allowed for unauthorized data exfiltration. The flaw, identified as CVE-2026-42824 and dubbed SearchLeak, enabled attackers to steal sensitive information from a user's mailbox, OneDrive, and SharePoint. Because the fix was implemented on the backend, organizations do not need to take any manual action to protect their environments. Source

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical SearchLeak Vulnerability in Microsoft 365 Copilot Exposes Sensitive Data A newly disclosed vulnerability in Microsoft 365 Copilot Enterprise, named SearchLeak (CVE-2026-42824), allows attackers to exfiltrate sensitive data with a single click on a crafted link. Discovered by Varonis Threat Labs, the attack exploits a chain of three vulnerabilities: parameter-to-prompt injection, an HTML rendering race condition, and a server-side request forgery (SSRF) via Bing. The attack targets emails, calendar entries, and files stored in OneDrive and SharePoint, enabling the theft of sensitive information such as MFA codes and access tokens. Microsoft rated the vulnerability as critical and patched it on June 4, 2026, requiring no action from users. The flaw is particularly dangerous as it bypasses traditional security measures due to the use of a legitimate Microsoft domain. No evidence of in-the-wild exploitation has been reported. 34 sources 71

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Microsoft patches SearchLeak vulnerability in Copilot for Microsoft 365

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