What is CVE-2026-55145?

CVE-2026-55145 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Outlook Copilot Tampering Vulnerability

Which CVE IDs does CVE-2026-55145 cover?

CVE-2026-55145 covers the following CVE IDs: CVE-2026-55145. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-55145?

CVE-2026-55145 has a CVSS v3 base score of 6.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-55145?

CVE-2026-55145 affects 1 product, including: Microsoft Copilot.

CVE-2026-55145MediumCVSS 6.3

Outlook Copilot Tampering Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

July 17, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-55145 →

📋 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.

🎯 Affected products1

Microsoft Copilot

🔗 References (1)

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