What is CVE-2026-55142?

CVE-2026-55142 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under CWE-197. CVSS score: 5.5/10. Published 2026-07-14.

How severe is CVE-2026-55142?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Microsoft 365 Apps For Enterprise

CVE-2026-55142

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Microsoft 365 Apps For Enterprise — versions 16.0.1
Microsoft Office 2019 — versions 19.0.0
Microsoft Office 365 For Mac — versions 1.0.0
Microsoft Office Ltsc 2021 — versions 16.0.1
Microsoft Office Ltsc 2024 — versions 16.0.0
Microsoft Sharepoint Enterprise Server 2016 — versions 16.0.0
Microsoft Sharepoint Server 2019 — versions 16.0.0
Microsoft Sharepoint Server Subscription Edition — versions 16.0.0
Microsoft Word 2016 — versions 16.0.1

Weakness classification (CWE)

CWE-197

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-55142?: CVE-2026-55142 is a medium-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under CWE-197. CVSS score: 5.5/10. Published 2026-07-14.
How severe is CVE-2026-55142?: Medium severity. CVSS v3 base score is 5.5 out of 10.