CVE-2026-47645
HighCVSS 8.8Exploitation Probability (EPSS)
Elevated risk55th percentile - higher than 55% of all known CVEs
Summary
A vulnerability in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to redirect users to an untrusted external site (open redirect), potentially leading to privilege escalation over a network.
Risk Assessment
An attacker could exploit this redirect to steal credentials or conduct a phishing attack, posing a security risk to the organization.
Recommendation
Apply security updates provided by Microsoft for Microsoft 365 Copilot immediately and monitor the environment for unusual redirects.
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Original NVD description (English source)
Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS