Microsoft · Security update · May 9, 2023

KB5002390: May 2023 security update

KB5002390, released May 9, 2023, fixes 3 CVEs in Microsoft SharePoint Server Subscription Edition. One of them is being exploited (CVE-2023-24955); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEVKnown ransomware use

CVEs closed

1 rated Critical

Exploited

CVE-2023-24955

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.8497

99th percentile

Priority of the 3 CVEs

Patch now 1
                                Urgent 2
                                High 0
                                Routine 0

Applies to

Product
Microsoft SharePoint Server Subscription Edition

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2023-24955	Microsoft Office SharePoint	Remote Code Execution	7.2	0.8497	KEVRansomwareExploited
Urgent	CVE-2023-24950	Microsoft Office SharePoint	Spoofing	6.5	0.6745	More likely
Urgent	CVE-2023-24954	Microsoft Office SharePoint	Information Disclosure	6.5	0.0179	More likely

Released the same day

KB5002365
Microsoft Word 2013 RT Service Pack 1, Microsoft Word 2013 Service Pack 1 (32-bit editions), Microsoft Word 2013 Service Pack 1 (64-bit editions)
KB5002369
Microsoft Word 2016 (32-bit edition), Microsoft Word 2016 (64-bit edition)
KB5002372
Microsoft Office Online Server
KB5002384
Microsoft Excel 2013 RT Service Pack 1, Microsoft Excel 2013 Service Pack 1 (32-bit editions), Microsoft Excel 2013 Service Pack 1 (64-bit editions)
KB5002386
Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
KB5002389
Microsoft SharePoint Server 2019
KB5002397
Microsoft SharePoint Enterprise Server 2016
KB5026361
Windows 10 Version 20H2 for 32-bit Systems, Windows 10 Version 20H2 for ARM64-based Systems, Windows 10 Version 21H2 for 32-bit Systems and 5 more
KB5026362
Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for ARM64-based Systems, Windows 10 Version 1809 for x64-based Systems and 2 more
KB5026363
Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more
KB5026366
Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2008 for 32-bit Systems Service Pack 2 and 7 more
KB5026368
Windows 11 version 21H2 for ARM64-based Systems, Windows 11 version 21H2 for x64-based Systems

Vendor advisory

https://support.microsoft.com/help/5002390

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