CVE-2026-55137: Microsoft Excel Remote Code Execution Vulnerability
Heap-based buffer overflow 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 16.0.5561.1001Patch KB5002886 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.111.26071215 - 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 16.0.10417.20175Patch KB5002884
Event History
Frequently Asked Questions
What is the severity of CVE-2026-55137?
CVE-2026-55137 has a high severity rating of 7.8.
What software is affected by CVE-2026-55137?
CVE-2026-55137 affects various versions of Microsoft Excel including Microsoft Excel 2016, Microsoft 365 Apps for Enterprise, and Microsoft Office 2024.
How do I fix CVE-2026-55137?
To mitigate CVE-2026-55137, users should install the latest security updates provided by Microsoft.
What type of vulnerability is CVE-2026-55137?
CVE-2026-55137 is a heap-based buffer overflow vulnerability.
What can an attacker do with CVE-2026-55137?
An attacker exploiting CVE-2026-55137 can execute arbitrary code locally on the affected system.