CVE-2026-20945 — Microsoft SharePoint Enterprise Server 2016
As of 2026-04-17, CVE-2026-20945 is a MEDIUM-severity vulnerability in Microsoft SharePoint Enterprise Server 2016, CVSS v3.1 4.6, EPSS 0.0% (13.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-20945, most recently “Microsoft April 2026 Patch Tuesday — 163 CVEs / 88 Advisories (CVE-2026-32201 SharePoint Zero-Day Exploited In-The-Wild, CVE-2026-33825 Defender EoP Public PoC, CVE-2026-33824 IKE RCE CVSS 9.8, CVE-2026-33827 TCP/IP Wormable RCE)”.
Last updated: 2026-04-17
What is CVE-2026-20945?
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
The record classifies CVE-2026-20945 under weakness class CWE-79. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 151 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 4.6 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - EPSS (FIRST)
- 0.0% probability of exploitation in the next 30 days, higher than 13.3% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 2.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-04-14, last modified 2026-04-17
Is CVE-2026-20945 being exploited?
It currently carries a trending score of 8 in the Threadlinqs vulnerability feed.
Affected products and versions
- Microsoft: SharePoint Enterprise Server 2016, SharePoint Server 2019, SharePoint Server Subscription Edition
How to fix CVE-2026-20945
The record marks a vendor fix as available for CVE-2026-20945. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20945. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-20945
1 tracked threat in the Threadlinqs corpus references CVE-2026-20945, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.
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