CVE-2026-50517
Medium
Elevated severity or exploit probability.
CVSS base
9.9
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.7%
76.1th percentile
CISA KEV
Not listed
Weakness / dates
CWE-502
Published 2026-07-24 · modified 2026-07-29
Description
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.