CVE-2026-55946 MEDIUM

CVE-2026-55946: Microsoft Copilot Information Disclosure Vulnerability

Vendor Microsoft

Product Microsoft Copilot

Weakness CWE-77

Published September 17, 2026

Last update September 19, 2026

View on NVD All CVEs

CVSS base score

6.1/10

Attack vector Network

Attack complexity High

Privileges required None

User interaction Required

Confidentiality High

Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/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 Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Key dates

02Disclosure timeline

September 17, 2026 CVE published

September 19, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-55946 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/77.html AskarLabs — CWE-77 write-up Command Injection

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