What is CVE-2026-42893?

CVE-2026-42893 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft Outlook for iOS Tampering Vulnerability

Which CVE IDs does CVE-2026-42893 cover?

CVE-2026-42893 covers the following CVE IDs: CVE-2026-42893. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-42893?

CVE-2026-42893 has a CVSS v3 base score of 7.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-42893?

CVE-2026-42893 affects 1 product, including: Microsoft Outlook for iOS.

CVE-2026-42893HighCVSS 7.4

Microsoft Outlook for iOS Tampering Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-42893 →

📋 Description

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.

🎯 Affected products1

Microsoft Outlook for iOS

✅ Remediation

Security Update — fixed build 5.2617.1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42893
patchhttps://apps.apple.com/us/app/microsoft-outlook/id951937596