What’s Vulnerable › Vulnerabilities

CVE-2026-47645: Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-19 · updated 2026-10-25
• Weakness: CWE-601

Description

Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.

Affected products

• Microsoft 365 Copilot: all versions
• Microsoft 365 Copilot: all versions

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47645

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