CVE-2022-46148 : Security Advisory and Response

Discourse allows self-XSS through malicious composer message.

Understanding CVE-2022-46148

Discourse, an open-source messaging platform, in certain versions, allows self-XSS through a malicious composer message leading to potential full XSS on vulnerable sites.

What is CVE-2022-46148?

CVE-2022-46148 arises from a vulnerability in Discourse versions 2.8.10 and earlier on the

stable

branch, as well as versions 2.9.0.beta11 and earlier on the

beta

and

tests-passed

branches. Users crafting malicious messages and then visiting the drafts page could expose themselves to a self-XSS exploit.

The Impact of CVE-2022-46148

The vulnerability poses a significant risk, potentially allowing threat actors to execute a full cross-site scripting (XSS) attack on websites that have altered or deactivated Discourse's default Content Security Policy. The severity of this vulnerability is rated as HIGH.

Technical Details of CVE-2022-46148

In the latest stable, beta, and tests-passed versions of Discourse, the issue has been addressed and patched.

Vulnerability Description

The vulnerability, with a CVSS base score of 7.1 (High), stems from improper neutralization of input during web page generation, also known as 'Cross-site Scripting' (CWE-79).

Affected Systems and Versions

Users of Discourse versions <= 2.8.10 and >= 2.9.0.beta1, <= 2.9.0.beta11 are affected by this vulnerability.

Exploitation Mechanism

Threat actors can exploit this vulnerability by creating and interacting with malicious composer messages that trigger the self-XSS condition, paving the way for potential full XSS attacks.

Mitigation and Prevention

It is crucial for organizations and users to take immediate action to mitigate the risks posed by CVE-2022-46148.

Immediate Steps to Take

Ensure that your Discourse installation is updated to the latest stable, beta, or tests-passed versions where the vulnerability has been fixed.

Long-Term Security Practices

Adopt robust security practices, including regular software updates, security monitoring, and adherence to secure coding standards.

Patching and Updates

Stay vigilant for future security advisories and promptly apply patches and updates to safeguard your Discourse deployment.