CVE-2026-88190: Microsoft Office Excel Information Disclosure Vulnerability
Published Oct 13, 2026
·Updated
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
11 affected componentsFixes available
Microsoft Office Excel
Microsoft 365 Apps
Microsoft 365 Apps
Microsoft Office 2021
Microsoft Office 2021
Microsoft Office 2024
Microsoft Office 2024
Microsoft Office LTSC 2024<16.0.17932.21056
16.0.17932.21056
Microsoft Office LTSC 2024<16.0.17932.21056
16.0.17932.21056
Microsoft Office LTSC 2021<16.0.14334.20974
16.0.14334.20974
Microsoft Office LTSC 2021<16.0.14334.20974
16.0.14334.20974
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 16.0.17932.21056
Event History
Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:01 PM
Data Sourced
via MITRE·07:01 PM
DescriptionSeverity
Data Sourced
via NVD·07:21 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What interaction does an attacker need to exploit this issue?
The attacker does not need privileges, but exploitation requires user interaction. The issue can be exploited over a network.
2
What is the expected impact if exploitation succeeds?
Successful exploitation can disclose information from Microsoft Office Excel. The listed impact affects confidentiality, with no stated integrity or availability impact.