CVE-2026-55054: Microsoft Excel Information Disclosure Vulnerability
Microsoft Excel Information Disclosure Vulnerability
Other sources
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
— 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 16.111.26071215 - 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 16.0.5561.1001Patch KB5002886 - 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-2026-55054?
CVE-2026-55054 has a medium severity rating of 6.5.
How do I fix CVE-2026-55054?
To fix CVE-2026-55054, ensure that you apply the latest updates provided by Microsoft for your version of Excel.
What products are affected by CVE-2026-55054?
CVE-2026-55054 affects Microsoft 365 Apps for Enterprise, Microsoft Excel 2016, Microsoft Office Online Server, Microsoft Office 2021, and Microsoft Office 2024.
What type of vulnerability is CVE-2026-55054?
CVE-2026-55054 is an information disclosure vulnerability that involves an out-of-bounds read in Microsoft Excel.
What can an attacker do with CVE-2026-55054?
An unauthorized attacker exploiting CVE-2026-55054 can disclose sensitive information over a network.