CVE-2026-55020 · Symaro Security Advisory

Description

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.

Severity (CVSS)

Base score	4.6
Severity	Medium
Version	CVSS 3.1
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
Provided by	CNA

Weaknesses

CWE-79 — CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

Vendor	Product	Versions
Microsoft	Microsoft SharePoint Enterprise Server 2016	16.0.0 to <16.0.5561.1001
Microsoft	Microsoft SharePoint Server 2019	16.0.0 to <16.0.10417.20175
Microsoft	Microsoft SharePoint Server Subscription Edition	16.0.0 to <16.0.19725.20434

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55020 (vendor-advisory patch)

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 15 Jul 2026 07:06 UTC.