Critical 9.8Known exploited (CISA KEV)Published Jan 13, 2026

CVE-2026-20963Microsoft SharePoint Remote Code Execution Vulnerability

Updated under an hour ago (2026-10-19 04:50 UTC)

Does this affect you?

It affects Microsoft SharePoint Enterprise Server 2016 and 3 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 18, 2026; federal agencies had to remediate by Mar 21, 2026. Treat that date as your deadline.

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Every CVE for Microsoft SharePoint Enterprise Server 2016

Exploited in the last 30 days

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Weakness (CWE): CWE-502
Known exploited: Added to CISA KEV Mar 18, 2026; federal remediation due Mar 21, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 29.20% (percentile 98)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Jul 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Microsoft SharePoint Enterprise Server 2016 microsoft:sharepoint_enterprise_server_2016 (from the name)	from 16.0.0 before 16.0.5535.1001	CNA record
Microsoft Microsoft SharePoint Server 2019 microsoft:sharepoint_server_2019 (from the name)	from 16.0.0 before 16.0.10417.20083	CNA record
Microsoft Microsoft SharePoint Server Subscription Edition microsoft:sharepoint_server_subscription_edition (from the name)	from 16.0.0 before 16.0.19127.20442	CNA record
microsoft sharepoint_server microsoft:sharepoint_server	before 16.0.19127.20442; 2016; 2019	NVD

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963vendor-advisory, patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.