CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-21511

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

Exploit prediction scoring system (EPSS) score

EPSS Score 0.003

EPSS Ranking 48.7%

CVSS Severity

CVSS v3 Score 7.5

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21511

Products affected by CVE-2026-21511

Microsoft » 365 Apps » Version: N/A

cpe:2.3:a:microsoft:365_apps:-
Microsoft » Office » Version: 2019

cpe:2.3:a:microsoft:office:2019
Microsoft » Office Long Term Servicing Channel » Version: 2021

cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021
Microsoft » Office Long Term Servicing Channel » Version: 2024

cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024
Microsoft » Sharepoint Server » Version: N/A

cpe:2.3:a:microsoft:sharepoint_server:-
Microsoft » Sharepoint Server » Version: 16.0.10417.20003

cpe:2.3:a:microsoft:sharepoint_server:16.0.10417.20003
Microsoft » Sharepoint Server » Version: 16.0.17328.20246

cpe:2.3:a:microsoft:sharepoint_server:16.0.17328.20246
Microsoft » Sharepoint Server » Version: 16.0.17328.20292

cpe:2.3:a:microsoft:sharepoint_server:16.0.17328.20292
Microsoft » Sharepoint Server » Version: 16.0.17328.20362

cpe:2.3:a:microsoft:sharepoint_server:16.0.17328.20362
Microsoft » Sharepoint Server » Version: 16.0.17928.20356

cpe:2.3:a:microsoft:sharepoint_server:16.0.17928.20356
Microsoft » Sharepoint Server » Version: 16.0.17928.20396

cpe:2.3:a:microsoft:sharepoint_server:16.0.17928.20396
Microsoft » Sharepoint Server » Version: 16.0.18526.20172

cpe:2.3:a:microsoft:sharepoint_server:16.0.18526.20172
Microsoft » Sharepoint Server » Version: 16.0.18526.20286

cpe:2.3:a:microsoft:sharepoint_server:16.0.18526.20286
Microsoft » Sharepoint Server » Version: 16.0.18526.20396

cpe:2.3:a:microsoft:sharepoint_server:16.0.18526.20396
Microsoft » Sharepoint Server » Version: 16.0.18526.20424

cpe:2.3:a:microsoft:sharepoint_server:16.0.18526.20424
Microsoft » Sharepoint Server » Version: 16.0.18526.20508

cpe:2.3:a:microsoft:sharepoint_server:16.0.18526.20508
Microsoft » Sharepoint Server » Version: 16.0.18526.20518

cpe:2.3:a:microsoft:sharepoint_server:16.0.18526.20518
Microsoft » Sharepoint Server » Version: 16.0.19127.20100

cpe:2.3:a:microsoft:sharepoint_server:16.0.19127.20100
Microsoft » Sharepoint Server » Version: 16.0.19127.20262

cpe:2.3:a:microsoft:sharepoint_server:16.0.19127.20262
Microsoft » Sharepoint Server » Version: 16.0.19127.20338

cpe:2.3:a:microsoft:sharepoint_server:16.0.19127.20338
Microsoft » Sharepoint Server » Version: 16.0.19127.20378

cpe:2.3:a:microsoft:sharepoint_server:16.0.19127.20378
Microsoft » Sharepoint Server » Version: 16.0.19127.20442

cpe:2.3:a:microsoft:sharepoint_server:16.0.19127.20442
Microsoft » Sharepoint Server » Version: 2016

cpe:2.3:a:microsoft:sharepoint_server:2016
Microsoft » Sharepoint Server » Version: 2019

cpe:2.3:a:microsoft:sharepoint_server:2019
Microsoft » Word » Version: 2016

cpe:2.3:a:microsoft:word:2016

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-21511

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