CVE-2026-88154: Microsoft Office Excel Information Disclosure Vulnerability
Microsoft Office 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 https://aka.ms/OfficeSecurityReleases - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.21056 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20974
Event History
Frequently Asked Questions
Which Excel deployments are identified as affected?
The affected software list includes Microsoft 365 Apps for Enterprise, Microsoft Office 365 for Mac, and Microsoft Office LTSC 2021 and LTSC 2024 in both 32-bit and 64-bit editions.
What must an attacker do to exploit this issue?
The provided vector indicates network reachability, low attack complexity, no required privileges, and required user interaction. The vulnerability is an out-of-bounds read that can disclose information.
What is the expected security impact?
The stated impact is information disclosure with high confidentiality impact. No integrity or availability impact is indicated in the supplied severity vector.