CVE-2026-45475 Details
Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
A heap-based buffer overflow vulnerability has been identified in Microsoft Office. This vulnerability allows an unauthorized attacker to execute code locally. It affects multiple versions of Microsoft Office, including Office 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, and various SharePoint Server editions. The vulnerability requires user interaction, as an attacker must send a malicious Office file and convince the user to open it.
Users can download the security update for Microsoft Office 2016, 2019, LTSC 2021, and LTSC 2024 through the Microsoft Update Catalog. For SharePoint Server 2019 and SharePoint Enterprise Server 2016, the security update is also available via the Microsoft Update Catalog. Instructions for updating Microsoft Office for Mac will be provided when the update becomes available.
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 Jun 10, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45475 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft 365 apps | All versions |
CPE
Remediation
| |
| microsoft microsoft 365 | All versions |
CPE
Remediation
| |
| microsoft office 2016 | 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 sharepoint server | < 16.0.19725.20384 2016 2019 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 19, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 9, 2026 | New CVE Received | [email protected] |