CVE-2026-47645: high-severity vulnerability in Microsoft 365 Copilot
Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.8%
exploitation probability
0.8%top 46% of all CVEs
observed exploitation
nono source reports it
Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Microsoft 365 CopilotRelated CVEs — Microsoft 365 Copilot
In the same product, most dangerous first.
CVE-2025-32711CRITICALM365 Copilot Information Disclosure VulnerabilityEPSS 8.0%CVE-2026-50517CRITICALMicrosoft M365 Copilot Remote Code Execution VulnerabilityEPSS 1.7%CVE-2026-54130CRITICALM365 Copilot Information Disclosure VulnerabilityEPSS 1.1%CVE-2026-24307CRITICALM365 Copilot Information Disclosure VulnerabilityEPSS 0.9%CVE-2026-42824MEDIUMM365 Copilot Information Disclosure VulnerabilityEPSS 0.9%CVE-2026-42827MEDIUMM365 Copilot Information Disclosure VulnerabilityEPSS 0.9%