What’s Vulnerable › Vulnerabilities

CVE-2026-68798: Microsoft Excel Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-10-30
• Weakness: CWE-122

Description

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Affected products

• Microsoft 365 Apps: all versions
• Microsoft 365: all versions
• Microsoft Office 2021: all versions
• Microsoft Office LTSC 2024: all versions
• Microsoft Office 365 for Mac: from 1.0.0 before 16.112.26081010 — fixed in 16.112.26081010

How to fix

Upgrade to a fixed version: Microsoft Office 365 for Mac 16.112.26081010. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68798

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