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CVE-2026-47645 is an elevation of privilege vulnerability in Microsoft 365 Copilot's Business Chat caused by a URL redirection to an untrusted site (open redirect). According to the provided advisory context, the flaw allows an unauthorized attacker to exploit Business Chat over a network by leveraging the application's handling of redirects to send a victim or workflow to attacker-controlled content. Microsoft classifies the issue as an elevation of privilege vulnerability affecting the Microsoft 365 Copilot cloud service. The supplied context does not identify a specific vulnerable function, endpoint, or code path beyond the open redirect condition in Business Chat.
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A Microsoft vulnerability addressed in the June 21, 2026 security updates. Specific technical details are not provided in the content.
An elevation of privilege vulnerability affecting Microsoft 365 Copilot's Business Chat.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.