CVE-2026-45469: Microsoft Excel Remote Code Execution Vulnerability
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Other sources
Microsoft Excel Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5556.1001Patch KB5002877 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in https://aka.ms/OfficeSecurityReleases - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.110.26061317 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20137Patch KB5002875
Event History
Frequently Asked Questions
What is the severity of CVE-2026-45469?
The severity of CVE-2026-45469 is high, rated at 7.8.
What type of vulnerability is CVE-2026-45469?
CVE-2026-45469 is an integer underflow vulnerability in Microsoft Excel.
How can I fix CVE-2026-45469?
To fix CVE-2026-45469, apply the latest updates for Microsoft Excel and other affected Microsoft Office applications.
What is the impact of CVE-2026-45469?
CVE-2026-45469 could allow an unauthorized attacker to execute code locally on the affected system.
Which software is affected by CVE-2026-45469?
CVE-2026-45469 affects Microsoft Excel 2016, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, 2021, and 2024.