CVSS 3.1
7.8 highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVE-2026-21259
High (7.8) in microsoft. EPSS 0.6% chance of exploitation in the next 30 days.
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.
Severity
- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-787, CWE-122
- Published
- Modified
- Record from
- the NVD, synced
Affected
- microsoft:365_apps
- microsoft:excel
- microsoft:office
- microsoft:office_long_term_servicing_channel
- microsoft:office_online_server