CVE-2026-55145

Analyzed Analyzed - Analysis Complete

Outlook Copilot Command Injection Vulnerability

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-14

Last Modified

2026-07-22

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-55145

EUVD

EUVD-2026-44226

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	copilot	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-77	The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This is a command injection vulnerability in Outlook Copilot where improper neutralization of special elements allows an authorized attacker to execute unauthorized commands over a network.

Impact Analysis

An attacker could tamper with data or system behavior by injecting malicious commands, potentially altering emails, attachments, or other Outlook Copilot functions.

Compliance Impact

This vulnerability could lead to unauthorized data tampering, potentially violating integrity requirements in GDPR or HIPAA if sensitive data is altered.

Mitigation Strategies

Apply the latest security updates from Microsoft for Outlook Copilot as soon as they become available to patch the command injection vulnerability.

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