CVE-2026-55145

MEDIUM

Microsoft Copilot - Outlook Copilot Tampering Vulnerability

Title source: rule

Description

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

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory patch

Outlook Copilot Tampering Vulnerability

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55145

Scores

CVSS v3 6.3

EPSS 0.0037

EPSS Percentile 29.8%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-77

Status published

Products (2)

microsoft/copilot

Microsoft/Microsoft Copilot -

Published Jul 14, 2026

Tracked Since Jul 14, 2026