Stored XSS in Microsoft Office SharePoint

 In Security Alerts

Systems Affected

  • Microsoft SharePoint Server 2019
Summary           : Stored XSS in Microsoft Office SharePoint
Date              : June 2019
Affected versions : Microsoft SharePoint Server 2019
CVE reference     : CVE-2019-1134

Threat Level

Medium

Overview

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks. The vulnerability exists due to insufficient sanitization of user-supplied data. A remote authenticated attacker can permanently inject and execute arbitrary HTML and script code in user’s browser in context of vulnerable website. [1]

Description

A cross-site-scripting (XSS) vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected SharePoint server. [2]

Impact

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Solution

We currently unaware of any official solution to address this vulnerability.

Reference

[1] https://www.cybersecurity-help.cz/vdb/SB2019062801

[2] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1134

Credits

Sharepoint XSS vulnerability was reported by Huynh Phuoc Hung (@hph0var)

Disclaimer

The information provided herein is on “as is” basis, without warranty of any kind.
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