CVE-2026-55057: Microsoft Office Information Disclosure Vulnerability
Published Jul 14, 2026
·Updated
Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.
Other sources
Microsoft Office Information Disclosure Vulnerability
— Microsoft
Affected Software
20 affected componentsFixes available
Microsoft 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps
Microsoft 365 Apps
Microsoft Microsoft 365 Macos
Microsoft Office 2016
Microsoft Office 2016
Microsoft Office 2019
Microsoft Office 2019
Microsoft Office 2021
Microsoft Office 2021
Microsoft Office 2021 Macos
Microsoft Office 2024
Microsoft Office 2024
Microsoft Office 2024 Macos
Microsoft Office 2016<16.0.5561.1000
16.0.5561.1000
Microsoft Office LTSC for Mac 2024<16.111.26071215
16.111.26071215
Microsoft Office 2016<16.0.5561.1000
16.0.5561.1000
Microsoft Office 365 for Mac<16.111.26071215
16.111.26071215
Microsoft Office LTSC for Mac 2021<16.111.26071215
16.111.26071215
Remediation
Event History
Jul 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
CVE Published
via MITRE·05:08 PM
Data Sourced
via MITRE·05:08 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-55057?
CVE-2026-55057 has a medium severity rating of 5.5.
2
How do I fix CVE-2026-55057?
To fix CVE-2026-55057, apply the security patch provided by Microsoft.
3
What systems are affected by CVE-2026-55057?
CVE-2026-55057 affects Microsoft Office 2016, Office 2019, Office 2021, Office 2024, Microsoft 365 Apps for Enterprise, and Office 365 for Mac.
4
What type of vulnerability is CVE-2026-55057?
CVE-2026-55057 is an integer overflow vulnerability that can lead to information disclosure.
5
Can CVE-2026-55057 lead to unauthorized information disclosure?
Yes, CVE-2026-55057 allows unauthorized attackers to disclose information locally.