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High severity7.5NVD Advisory· Published Feb 10, 2026· Updated Jun 17, 2026

CVE-2026-21511

CVE-2026-21511

Description

Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Affected products

26
  • Microsoft/Microsoft 365 Apps for Enterprisev5
    Range: 16.0.1
  • Microsoft/Office Outlookllm-fuzzy
  • Microsoft/Office Visiocpe-rescue
    Range: 19.0.0
  • Microsoft/Sharepoint Servercpe-rescue5 versions
    16.0.0+ 4 more
    • (no CPE)range: 16.0.0
    • cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*range: <16.0.19127.20518
    • cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
    • cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
    • (no CPE)range: 16.0.0
  • Microsoft/365 Apps2 versions
    cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*+ 1 more
    • cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
    • cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
  • Microsoft/Office4 versions
    cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*+ 3 more
    • cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*
    • cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*
    • (no CPE)range: 16.0.1
    • (no CPE)range: 16.0.0
  • Microsoft/Office Long Term Servicing Channel6 versions
    cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*+ 5 more
    • cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*
    • cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*
    • cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*
    • cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*
    • cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*
    • cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*
  • Microsoft/Word3 versions
    cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*+ 2 more
    • cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
    • cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*
    • (no CPE)range: 16.0.1
  • Microsoft/Office SharePointcpe-rescue
    Range: 16.0.0
  • Microsoft/Office For Maccpe-rescue2 versions
    16.0.1+ 1 more
    • (no CPE)range: 16.0.1
    • (no CPE)range: 16.0.0

Patches

Vulnerability mechanics

References

1

News mentions

0

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