CVE-2019-12250 : What You Need to Know

A vulnerability has been discovered in IdentityServer4 versions 2.4 and below, involving stored XSS (cross-site scripting) via the httpContext in the LogForErrorContext method of the RequestLoggerMiddleware.cs file located in the host/Extensions directory. The software maintainer disputes this issue as a vulnerability.

Understanding CVE-2019-12250

This CVE involves a disputed vulnerability in IdentityServer4 versions 2.4 and below related to stored XSS via the httpContext in the LogForErrorContext method.

What is CVE-2019-12250?

CVE-2019-12250 is a vulnerability in IdentityServer4 versions 2.4 and below that allows for stored XSS through the httpContext in the LogForErrorContext method.

The Impact of CVE-2019-12250

Exploitation can lead to cross-site scripting attacks via the viewing of a log
The software maintainer disagrees with the classification of this issue as a vulnerability

Technical Details of CVE-2019-12250

This section provides technical details about the vulnerability.

Vulnerability Description

The vulnerability involves stored XSS via the httpContext in the LogForErrorContext method of the RequestLoggerMiddleware.cs file.

Affected Systems and Versions

IdentityServer4 versions 2.4 and below

Exploitation Mechanism

Accessing a log triggers the vulnerability

Mitigation and Prevention

Protect your systems from CVE-2019-12250 with the following steps:

Immediate Steps to Take

Monitor and restrict access to logs
Implement input validation to prevent XSS attacks

Long-Term Security Practices

Regular security training for developers
Conduct security audits and code reviews

Patching and Updates

Stay informed about security updates from IdentityServer4