CVE-2026-78515: 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 16.0.5569.1000Patch KB5002916 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20896 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.20960 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20326.20136 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20204
Event History
Frequently Asked Questions
What must an attacker do to exploit this issue?
The attacker can attempt exploitation over a network without prior privileges, but user interaction is required. The issue is an out-of-bounds read in Excel that may disclose information.
Which deployments should be reviewed?
Review systems using Microsoft Office 2016, Microsoft 365 Apps for Enterprise, Microsoft Office Excel, Office LTSC 2021 for 32-bit editions, Office LTSC 2024 for 32-bit or 64-bit editions, and Office LTSC for Mac 2021 or 2024.
Does exploitation affect confidentiality, integrity, or availability?
The provided severity vector indicates high confidentiality impact. It does not indicate integrity or availability impact.