CVE-2026-42827 MEDIUM

CVE-2026-42827: M365 Copilot Information Disclosure Vulnerability

Vendor Microsoft

Product Microsoft 365 Copilot

Weakness CWE-77

Published May 22, 2026

Last update June 9, 2026

View on NVD All CVEs

CVSS base score

6.5/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality High

Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

May 22, 2026 CVE published

June 9, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-42827 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/77.html

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