What is CVE-2026-42893?

CVE-2026-42893 is a high-severity vulnerability in Microsoft Outlook For Ios, classified under Command Injection. CVSS score: 7.4/10. Published 2026-05-12.

How severe is CVE-2026-42893?

High severity. CVSS v3 base score is 7.4 out of 10.

RCE in Microsoft Outlook For Ios

CVE-2026-42893

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

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.001 (17.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N.

Affected products

Microsoft Outlook For Ios — versions 1.0.0
Microsoft Outlook

Weakness classification (CWE)

CWE-77 — Command Injection

References

Microsoft Outlook for iOS Tampering Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42893?: CVE-2026-42893 is a high-severity vulnerability in Microsoft Outlook For Ios, classified under Command Injection. CVSS score: 7.4/10. Published 2026-05-12.
How severe is CVE-2026-42893?: High severity. CVSS v3 base score is 7.4 out of 10.