High severity · published May 12, 2026
CVE-2026-35439
Microsoft SharePoint Server Remote Code Execution Vulnerability
8.8
CVSS
2%
EPSS
No
On KEV
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.0% · higher than 81% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SH
SharePoint · Microsoft
before 16.0.19725.20280; 2016; 2019 · source: NVD
MS
Microsoft SharePoint Enterprise Server 2016 · Microsoft
16.0.0 before 16.0.5552.1002 · source: vendor
MS
Microsoft SharePoint Server 2019 · Microsoft
16.0.0 before 16.0.10417.20128 · source: vendor
MS
Microsoft SharePoint Server Subscription Edition · Microsoft
16.0.0 before 16.0.19725.20280 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35439
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-35439
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35439
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