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CVE-2026-21259

Microsoft Excel Elevation of Privilege Vulnerability

CVSS 7.8 HIGHEPSS 0.5%CWE-122
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.8EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado
Lifecycle
10 Feb 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Microsoft 365 Apps for EnterpriseMicrosoft · Microsoft Excel 2016Microsoft · Microsoft Office 2019Microsoft · Microsoft Office LTSC 2021Microsoft · Microsoft Office LTSC 2024Microsoft · Office Online Server
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21259