Review reviewHigh

CVE-2026-44822

Microsoft Microsoft 365 Apps for Enterprise, Microsoft Excel 2016, Microsoft Office 2019

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.52%

Technical severityCVSS 8.2

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

Product: Microsoft Microsoft 365 Apps for Enterprise, Microsoft Excel 2016, Microsoft Office 2019
Affected versions: >= 16.0.1 < https://aka.ms/OfficeSecurityReleases, >= 16.0.0.0 < 16.0.5556.1001, >= 19.0.0 < https://aka.ms/OfficeSecurityReleases, >= 1.0.0 < 16.110.26061317, >= 16.0.0 < https://aka.ms/OfficeSecurityReleases, >= 16.0.1 < 16.110.26061317, >= 16.0.0 < 16.110.26061317, >= 16.0.0.0 < 16.0.10417.20137, 2016
Fixed versions: No verified fixed-version field is available yet

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Microsoft 365 Apps for Enterprise, Microsoft Excel 2016, Microsoft Office 2019 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.