CVSS v3
9.9
CRITICAL
EPSS Score
1.3%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
Active exploitation of CVE-2026-50517 has not been confirmed. The EPSS score is 1.3%, indicating the estimated probability of exploitation in the next 30 days.
CVE-2026-50517 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string 3.1.
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