CVE-2020-6802 : Vulnerability Insights and Analysis

In Mozilla Bleach before 3.11, a mutation XSS vulnerability affects users calling bleach.clean with specific tags in the allowed/whitelisted tags option.

Understanding CVE-2020-6802

This CVE involves a mutation XSS vulnerability in Mozilla Bleach before version 3.11.

What is CVE-2020-6802?

A mutation XSS vulnerability in Mozilla Bleach before version 3.11
Users affected when calling bleach.clean with specific tags in the allowed/whitelisted tags option

The Impact of CVE-2020-6802

Attackers can exploit this vulnerability to execute malicious scripts in the context of the user's browser session
Potential for unauthorized access to sensitive information or actions on behalf of the user

Technical Details of CVE-2020-6802

This section provides technical details about the vulnerability.

Vulnerability Description

Mutation XSS vulnerability in Mozilla Bleach before version 3.11
Occurs when bleach.clean is called with noscript and a raw tag in the allowed/whitelisted tags option

Affected Systems and Versions

Product: Mozilla Bleach
Vendor: n/a
Versions affected: <=3.10

Exploitation Mechanism

Attackers can craft malicious input containing scripts
By tricking a user into processing this input with bleach.clean, the script gets executed

Mitigation and Prevention

Protect your systems from CVE-2020-6802 with these mitigation strategies.

Immediate Steps to Take

Upgrade Mozilla Bleach to version 3.11 or higher
Avoid processing untrusted input with bleach.clean

Long-Term Security Practices

Regularly update software to the latest versions
Implement input validation and output encoding to prevent XSS attacks

Patching and Updates

Stay informed about security advisories and patches from Mozilla Bleach