CVE-2026-70355: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft SharePoint Server 2019
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-70355) in Microsoft SharePoint Server 2019 (version 16.0.0) is classified as CWE-79, improper neutralization of input during web page generation, commonly known as cross-site scripting (XSS). It allows an attacker with authorized access to inject malicious scripts that can elevate their privileges within the network environment. The CVSS 3.1 vector indicates network attack vector, low attack complexity, required privileges at the level of an authorized user, user interaction required, unchanged scope, and high impact on confidentiality and integrity. The vendor advisory does not currently specify a remediation or patch availability.
Potential Impact
An authorized attacker exploiting this XSS vulnerability can elevate their privileges within the affected SharePoint Server environment, potentially compromising confidentiality and integrity of data. There is no reported impact on availability. No known exploits are currently reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Microsoft vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355 for current remediation guidance. Until an official fix is released, organizations should limit authorized user privileges and monitor for suspicious activity related to SharePoint Server 2019 version 16.0.0.
CVE-2026-70355: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft SharePoint Server 2019
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 7.3high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-70355) in Microsoft SharePoint Server 2019 (version 16.0.0) is classified as CWE-79, improper neutralization of input during web page generation, commonly known as cross-site scripting (XSS). It allows an attacker with authorized access to inject malicious scripts that can elevate their privileges within the network environment. The CVSS 3.1 vector indicates network attack vector, low attack complexity, required privileges at the level of an authorized user, user interaction required, unchanged scope, and high impact on confidentiality and integrity. The vendor advisory does not currently specify a remediation or patch availability.
Potential Impact
An authorized attacker exploiting this XSS vulnerability can elevate their privileges within the affected SharePoint Server environment, potentially compromising confidentiality and integrity of data. There is no reported impact on availability. No known exploits are currently reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Microsoft vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355 for current remediation guidance. Until an official fix is released, organizations should limit authorized user privileges and monitor for suspicious activity related to SharePoint Server 2019 version 16.0.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-04T00:04:56.038Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355","vendor":"Microsoft"}]
Threat ID: 6a7b5841bf8831d539156a76
Added to database: 08/11/2026, 17:13:37 UTC
Last enriched: 08/11/2026, 17:26:32 UTC
Last updated: 08/12/2026, 02:27:26 UTC
Views: 7
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