CVE-2026-88153: 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 16.0.14334.20974 - 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
Event History
Frequently Asked Questions
Which Office deployments are identified as affected?
The affected products listed are Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021 for 32-bit and 64-bit editions, and Microsoft Office LTSC 2024 for 32-bit and 64-bit editions.
What level of access does an attacker need?
The vector indicates network reachability and no privileges are required. However, user interaction is required for exploitation.
What is the expected impact if exploitation succeeds?
Successful exploitation can disclose information through an out-of-bounds read. The provided scoring indicates high confidentiality impact, with no integrity or availability impact.