CVE-2026-26164

High

Open

TLP:CLEAR

M365 Copilot Information Disclosure Vulnerability

NVD CVE.org

Critical Infrastructure

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Description

Improper neutralization of special elements in output used by a downstream component ('injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.80%

53.3th percentile
CVSS Vector: 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
Confidence: 90%
Published: May 7, 2026
Last Modified: May 14, 2026

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