CVE-2021-41252 : Vulnerability Insights and Analysis

Kirby, an open-source file structured CMS, was vulnerable to cross-site scripting (XSS) attacks through the writer field content. This vulnerability allowed attackers to inject malicious HTML code into the site frontend.

Understanding CVE-2021-41252

This vulnerability in Kirby's writer field content exposed users to potential XSS attacks, affecting certain versions of the platform.

What is CVE-2021-41252?

Kirby's writer field stored formatted content as HTML code without properly escaping HTML special characters, leading to XSS vulnerabilities that could be exploited by authenticated Panel users.

The Impact of CVE-2021-41252

CVSS Base Score: 7.3 (High)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Impact: High impact on Confidentiality and Integrity

Technical Details of CVE-2021-41252

This section provides in-depth technical details of the vulnerability.

Vulnerability Description

The writer field in Kirby did not securely sanitize content, allowing authenticated attackers to inject and execute malicious HTML code on the site frontend.

Affected Systems and Versions

Affected Product: Kirby
Vendor: getkirby
Affected Versions: >= 3.5.0, < 3.5.8

Exploitation Mechanism

Attackers could abuse the writer field to execute harmful scripts, leveraging the permissions of the victim.

Mitigation and Prevention

Learn how to mitigate and prevent the exploitation of CVE-2021-41252.

Immediate Steps to Take

Update Kirby to version 3.5.8 or a later version to resolve this issue.

Long-Term Security Practices

Regularly review and update security configurations.
Educate users on safe content creation practices.

Patching and Updates

Refer to the provided links for patch details and updates.