CVE-2026-55145 MEDIUM

CVE-2026-55145: Outlook Copilot Tampering Vulnerability

Vendor Microsoft

Product Microsoft Copilot

Weakness CWE-77

Published July 14, 2026

Last update July 24, 2026

View on NVD All CVEs

CVSS base score

6.3/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction Required

Confidentiality High

Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Improper neutralization of special elements used in a command ('command injection') in Outlook Copilot allows an authorized attacker to perform tampering over a network.

Key dates

02Disclosure timeline

July 14, 2026 CVE published

July 24, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-55145 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/77.html AskarLabs — CWE-77 write-up Command Injection

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