365 Apps CVE-2026-26108
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap buffer overflow in Microsoft Office Excel enables local code execution with high integrity and confidentiality impact affecting Office, Office Online Server, and 365 Apps. An attacker with user interaction can achieve arbitrary code execution in the context of the affected application. …
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RemediationAI
Within 24 hours: Inventory all Excel deployments and identify systems processing sensitive data; disable Excel file previews in email clients and file explorers. Within 7 days: Implement application whitelisting for Excel.exe, restrict Excel to trusted users only, and conduct risk assessment of high-value spreadsheets. …
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