CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2026-21511
High (7.5) in microsoft. EPSS 4.0% chance of exploitation in the next 30 days.
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Severity
- EPSS
- 4.0% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)
- CWE
- CWE-502
- Published
- Modified
- Record from
- the NVD, synced
Affected
- microsoft:365_apps
- microsoft:office
- microsoft:office_long_term_servicing_channel
- microsoft:sharepoint_server
- microsoft:word