CVE-2026-64903 in Office

Summary

by MITRE • 08/11/2026

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

• Responsible: Microsoft
• Reservation: 07/20/2026
• Disclosure: 08/11/2026
• Moderation: accepted
• Entry: VDB-388705
• CPE: ready
• CWE: CWE-190 (confirmed)
• CVSS: 6.3 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Police, Government, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-64903
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-64903
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-64903/