CVE-2026-50517: critical vulnerability in Microsoft 365 Copilot
Microsoft M365 Copilot Remote Code Execution Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.9epss 1.7%
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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 9.3%CVE-2026-42824MEDIUMM365 Copilot Information Disclosure VulnerabilityEPSS 7.6%CVE-2026-54130CRITICALM365 Copilot Information Disclosure VulnerabilityEPSS 1.1%CVE-2026-24307CRITICALM365 Copilot Information Disclosure VulnerabilityEPSS 0.9%CVE-2026-85887HIGHM365 Copilot Information Disclosure VulnerabilityEPSS 0.8%CVE-2026-24299MEDIUMM365 Copilot Information Disclosure VulnerabilityEPSS 0.8%