CVE-2020-26293 MEDIUM

CVE-2020-26293: Possible XSS bypass if style tag is allowed

Vendor Mganss
Product HtmlSanitizer
Weakness CWE-74
Published January 4, 2021
Last update August 4, 2024

CVSS base score

6.1/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality None
Integrity High

CVSS vector

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

What the vulnerability does

01Description

HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. In HtmlSanitizer before version 5.0.372, there is a possible XSS bypass if style tag is allowed. If you have explicitly allowed the `<style>` tag, an attacker could craft HTML that includes script after passing through the sanitizer. The default settings disallow the `<style>` tag so there is no risk if you have not explicitly allowed the `<style>` tag. The problem has been fixed in version 5.0.372.

Key dates

02Disclosure timeline

January 4, 2021 CVE published
August 4, 2024 Record updated