Out-of-bounds Read in Microsoft 365_apps
CVE-2026-45455
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Vulnerability class: Buffer Overflow
EPSS: 0.006 (46.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
Affected products
- Microsoft 365_apps
- Microsoft Excel — versions 2016
- Microsoft Microsoft_365
- Microsoft 365 Apps For Enterprise — versions 16.0.1
- Microsoft Excel 2016 — versions 16.0.0.0
- 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
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45455?
- CVE-2026-45455 is a low-severity vulnerability in Microsoft 365_apps, classified under Out-of-bounds Read. CVSS score: 3.3/10. Published 2026-06-09.
- How severe is CVE-2026-45455?
- Low severity. CVSS v3 base score is 3.3 out of 10.