CVE-2026-26109 Details
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
A vulnerability allowing out-of-bounds read has been identified in Microsoft Office Excel. This issue enables an unauthorized attacker to execute code locally. The vulnerability is present in multiple versions of Excel, including Excel 2016 (both 32-bit and 64-bit editions), Office LTSC for Mac 2021 and 2024, Office LTSC 2021 and 2024 for Windows (both 32-bit and 64-bit editions), Microsoft 365 Apps for Enterprise (also in both 32-bit and 64-bit systems), and Office Online Server.
Users can download the security update for this vulnerability through the Microsoft Update Catalog. For Office LTSC for Mac, the security update is available via the Mac App Store.
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 Mar 5, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26109 | [email protected] | Vendor 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 office | 2019 |
CPE
Remediation
| |
| microsoft office long term servicing channel | 2021 2024 |
CPE
Remediation
| |
| microsoft office online server | < 16.0.10417.20102 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 13, 2026 | Initial Analysis | [email protected] |
| Mar 10, 2026 | New CVE Received | [email protected] |