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CVE-2026-45659

CVSS

8.8

Reports

5

First seen

May 22

Last seen

Jun 5

Affected product

Microsoft SharePoint Server (Subscription Edition, 2019, Enterprise Server 2016)

Associated actors

bandcampro ×1 BlackSuit ×1 GlassWorm ×1 GREYVIBE ×1 Payload ×1

Recent reports

Microsoft SharePoint High-Risk Insecure Deserialization Vulnerability (CVE-2026-45659)

NICS TaiwanJun 5 High

Weekly Cyber Recap: PAN-OS Exploit, Gogs RCE, GlassWorm C2 Takedown, AI-Driven Attacks

The Hacker NewsJun 1 High

Microsoft Security Advisory – May 2026 Monthly Rollup (AV26-456) Update 1

Canadian Centre AlertsMay 27 High

Microsoft Patches SharePoint RCE Flaw CVE-2026-45659 Across Server Versions

The Hacker NewsMay 26 High

Multiple Vulnerabilities in Microsoft Products (A26-05-41)

GovCERT.HKMay 22

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