CVSS 3.1
7.8 highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVE-2026-20957
High (7.8) in microsoft. EPSS 0.5% chance of exploitation in the next 30 days.
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Severity
- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-122, CWE-191
- 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