CVE-2026-68799 Microsoft CVE debrief

Who should care

Defenders responsible for Microsoft Office products, particularly those using Microsoft Excel, should assess exposure and apply patches to prevent local information disclosure.

Why it matters

CVE-2026-68799 is a Microsoft Excel Information Disclosure Vulnerability that allows unauthorized attackers to disclose information locally. Defenders should assess exposure, particularly for those using Microsoft Office products, and apply patches to prevent potential data exposure.

• Local information disclosure due to uninitialized resource use
• Potential data exposure in affected Microsoft Office products
• Need to verify and apply patches for multiple Microsoft Office versions
• Importance of updating inventory and monitoring for affected products

Technical summary

The vulnerability is caused by the use of an uninitialized resource in Microsoft Office Excel, allowing an unauthorized attacker to disclose information locally. The vulnerability affects multiple Microsoft Office products, including Microsoft 365 Apps for Enterprise, Microsoft Excel 2016, Microsoft Office 2019, Microsoft Office 365 for Mac, and Microsoft Office LTSC 2021 and 2024.

Defensive priority

Apply patches for affected Microsoft Office products to prevent local information disclosure.

Recommended defensive actions

• Apply patches for Microsoft 365 Apps for Enterprise
• Apply patches for Microsoft Excel 2016
• Apply patches for Microsoft Office 2019
• Update Microsoft Office 365 for Mac
• Apply patches for Microsoft Office LTSC 2021 and 2024

Evidence notes

The CVE record and source item provide details on the vulnerability and affected products. Microsoft has released patches for these vulnerabilities. Defenders should verify affected product deployments, review official advisories, and plan updates or mitigations. Compensating controls should be reviewed for exposed systems while remediation is scheduled and verified. Monitoring, detection, and logs should be checked for exposed assets that need extra review.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.