CVE-2026-77898 in Office

Summary

by MITRE • 09/08/2026

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network.

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• Responsible: Microsoft
• Reservation: 08/21/2026
• Disclosure: 09/08/2026
• Moderation: accepted
• Entry: VDB-400849
• CPE: ready
• CWE: CWE-120 (confirmed)
• CVSS: 7.5 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Industry, Hospital, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-77898
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77898
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-77898/