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CVE-2026-26164

M365 Copilot Information Disclosure Vulnerability

CVSS 7.5 HIGHEPSS 0.8%CWE-74
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Affected products
Microsoft · Microsoft 365 Copilot's Business Chat

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References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26164