CVE-2026-88195: Microsoft Office Excel Information Disclosure Vulnerability
Buffer over-read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
Other sources
Microsoft Office Excel Information Disclosure 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 https://aka.ms/OfficeSecurityReleases - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20974 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.21056
Event History
Frequently Asked Questions
What must an attacker do to exploit this issue?
The attacker can exploit it over a network without authentication, but user interaction is required. The provided data does not specify the exact user action or delivery mechanism.
What is the expected security impact?
Successful exploitation may disclose information. The supplied vector indicates high confidentiality impact, with no integrity or availability impact.
Which Excel deployments are identified as affected?
The listed affected products are Microsoft 365 Apps for Enterprise and Microsoft Office LTSC 2021 and 2024, in both 32-bit and 64-bit editions where listed.