CVE-2026-55046 Details
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
A vulnerability allowing out-of-bounds read has been identified in Microsoft Office Excel. This issue could enable an unauthorized attacker to disclose information locally. The vulnerability is present in several versions of Microsoft Excel, including Excel 2016 (32-bit and 64-bit editions), Excel 2019 (32-bit and 64-bit editions), Office LTSC 2021 (32-bit and 64-bit editions), Office LTSC for Mac 2021, Office LTSC for Mac 2024, Office 365 for Mac, and Excel 2024 (32-bit and 64-bit editions).
Users can download the security update for this vulnerability through the Microsoft Update Catalog. Security update details are available on the Microsoft Office Security Updates page.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55046 | [email protected] | PatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 apps | All versions |
CPE
Remediation
| |
| microsoft excel | 2016 |
CPE
Remediation
| |
| microsoft microsoft 365 | All versions |
CPE
Remediation
| |
| microsoft office 2019 | All versions |
CPE
Remediation
| |
| microsoft office 2021 | All versions |
CPE
Remediation
| |
| microsoft office 2024 | All versions |
CPE
Remediation
| |
| microsoft office online server | < 16.0.10417.20175 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 16, 2026 | Initial Analysis | [email protected] |
| Jul 15, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |