Cybersecurity Advisory
Microsoft Copilot Email and Teams Summarization Vulnerability Enables Phishing Attacks
6 months ago
20.00 GMT
AI assistants have rapidly transformed daily operations, streamlining tasks for teams managing overloaded inboxes, client communications, and incident response. Researchers from Permiso Security discovered a cross-prompt injection vulnerability in Microsoft 365 Copilot’s email summarization features, tracked as CVE-2026-26133. The flaw allows attackers to manipulate Copilot’s generated summaries by embedding attacker-controlled instructions within a normal email.
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