CVE-2021-23260 : What You Need to Know

This article provides an overview of CVE-2021-23260, a Stored XSS Vulnerability in File Name of the File Upload function discovered in Crafter CMS.

Understanding CVE-2021-23260

CVE-2021-23260 is a security vulnerability in Crafter CMS that allows authenticated users with Site roles to inject XSS scripts via file names. These malicious scripts can execute in the browser for the user and other users of the same site.

What is CVE-2021-23260?

The vulnerability in Crafter CMS enables attackers to manipulate file names to inject and execute XSS scripts, compromising the confidentiality of affected user information.

The Impact of CVE-2021-23260

The impact of CVE-2021-23260 is considered medium, with a CVSSv3.1 base score of 6.5. It poses a threat to the confidentiality of user data, although the availability impact is rated as low.

Technical Details of CVE-2021-23260

The following technical details outline the vulnerability specifics:

Vulnerability Description

Authenticated users with specific roles can leverage the vulnerability to introduce harmful XSS scripts via file names in Crafter CMS.

Affected Systems and Versions

Crafter CMS versions less than 3.1.12 are affected by this vulnerability, particularly version 3.1 with custom installations.

Exploitation Mechanism

The attack complexity is high, requiring low privileges from the attacker. A network attack vector is used, and user interaction is necessary to execute the injected scripts.

Mitigation and Prevention

To address CVE-2021-23260 and enhance security, consider the following steps:

Immediate Steps to Take

Upgrade Crafter CMS to version 3.1.12 or higher to mitigate the vulnerability.
Regularly monitor and audit file uploads and names to detect suspicious activity.

Long-Term Security Practices

Educate users on safe file naming conventions and the risks associated with XSS vulnerabilities.
Implement strict input validation to prevent the execution of malicious scripts through file names.

Patching and Updates

Stay informed about security advisories from Crafter Software and apply patches promptly to protect against known vulnerabilities.