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CVE-2026-21511
HIGH
CVSS: 7.5
Published: 2026-02-10
Modified: 2026-06-17
Description
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Affected Platforms
Microsoft 365 AppsMicrosoft Office Long Term Servicing ChannelMicrosoft WordMicrosoft Sharepoint ServerMicrosoft Office