Out-of-bounds Read in Microsoft 365 Apps For Enterprise
CVE-2026-56193
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.
Affected products
- Microsoft 365 Apps For Enterprise — versions 16.0.1
- Microsoft Office 2016 — versions 16.0.0
- 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 Office Ltsc For Mac 2021 — versions 16.0.1
- Microsoft Office Ltsc For Mac 2024 — versions 16.0.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-56193?
- CVE-2026-56193 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-07-14.
- How severe is CVE-2026-56193?
- High severity. CVSS v3 base score is 7.1 out of 10.