Exposure of Sensitive System Information to an Unauthorized Control Sphere in Microsoft products - CVE-2026-81394
Published: September 9, 2026
Vulnerability identifier: #VU148287
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-81394
CWE-ID: CWE-497
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive system information.
The vulnerability exists due to exposure of sensitive system information to an unauthorized control sphere in Microsoft Office Excel when a user opens an Excel file. A remote attacker can exploit the vulnerability to disclose sensitive system information.
The disclosed information may include uninitialized stack memory.
Affected software
Microsoft Excel
Microsoft 365 Apps for Enterprise
Microsoft Office
Microsoft 365 Apps for Enterprise
Microsoft Office
How to mitigate CVE-2026-81394
Install security update from vendor's website.
Microsoft Excel - update to 16.0.5569.1003
Microsoft 365 Apps for Enterprise - update to 16.0.20326.20138
Microsoft Office - addressed in versions 16.0.5569.1003, 16.0.10417.20207, 16.0.14334.20906, 16.0.17932.20976
Microsoft 365 Apps for Enterprise - update to 16.0.20326.20138
Microsoft Office - addressed in versions 16.0.5569.1003, 16.0.10417.20207, 16.0.14334.20906, 16.0.17932.20976