CVE-2026-77503 in Windows

Summary

by MITRE • 09/09/2026

Out-of-bounds read in Windows NTFS allows an unauthorized attacker to elevate privileges locally.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

• Responsible: Microsoft
• Reservation: 08/20/2026
• Disclosure: 09/09/2026
• Moderation: accepted
• Entry: VDB-401283
• CPE: ready
• CWE: CWE-125 (confirmed)
• CVSS: 8.4 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Government, Education, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-77503
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77503
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-77503/