CVE-2026-21511
CVE-2026-21511: 1 tracked advisory record across MS Server. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
MS Server
1 advisory- Advisory severityHigh7.5
High [CVE-2026-21511] Microsoft Outlook Spoofing Vulnerability
CVE-2026-21511Source published Source updated
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network. Affected products named by the advisory: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.
- Affected products in this advisory
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition
- Source-reported affected versions
- Microsoft 365 Apps for Enterprise 16.0.1 before https://aka.ms/OfficeSecurityReleases
- Microsoft Office 2019 19.0.0 before https://aka.ms/OfficeSecurityReleases
- Microsoft Office LTSC 2021 16.0.1 before https://aka.ms/OfficeSecurityReleases
- Microsoft Office LTSC 2024 16.0.0 before https://aka.ms/OfficeSecurityReleases
6 more entries in the full advisory.
- Source-reported fixed versions
- https://aka.ms/OfficeSecurityReleases
- 16.106.26020821
- 16.0.5539.1002
- 16.0.10417.20097
1 more entries in the full advisory.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
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