CVE-2026-20963

critical · 9.8Actively exploited

On the CISA Known Exploited Vulnerabilities catalog

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Added 2026-03-18Remediation due 2026-03-21

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

9.8

CVSS

32.6%

EPSS (exploit prob.)

98th

EPSS percentile

2026-01-13

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-502

Affected products

Vendor	Product	Affected versions
microsoft	sharepoint_server	< 16.0.19127.20442
microsoft	sharepoint_server	2016
microsoft	sharepoint_server	2019

Check a specific version with /api/v1/cve/match.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-20963