CVE-2026-55025: Microsoft Excel Remote Code Execution Vulnerability
Access of resource using incompatible type ('type confusion') 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-2026-55025?
CVE-2026-55025 has a severity rating of 7.8, categorized as high.
How do I fix CVE-2026-55025?
To mitigate CVE-2026-55025, ensure that you apply the latest security updates provided by Microsoft for supported versions of Excel.
What products are affected by CVE-2026-55025?
CVE-2026-55025 affects Microsoft Excel 2016, 2019, 2021, 2024, Microsoft 365 Apps for Enterprise, and Microsoft Office Online Server.
What type of vulnerability is CVE-2026-55025?
CVE-2026-55025 is classified as a Remote Code Execution vulnerability due to type confusion.
What are the potential impacts of exploiting CVE-2026-55025?
Exploiting CVE-2026-55025 could allow an unauthorized attacker to execute arbitrary code on the affected systems.