CVE-2021-39357 : Vulnerability Insights and Analysis
Learn about CVE-2021-39357 affecting Leaky Paywall plugin versions up to 4.16.5. Understand the impact, technical details, and mitigation steps.
Leaky Paywall WordPress plugin versions up to and including 4.16.5 are vulnerable to Stored Cross-Site Scripting, allowing attackers with administrative user access to inject arbitrary web scripts.
Understanding CVE-2021-39357
The Leaky Paywall WordPress plugin has a vulnerability that exposes websites to Stored Cross-Site Scripting attacks.
What is CVE-2021-39357?
The vulnerability in Leaky Paywall up to version 4.16.5 permits attackers with administrative user access to execute malicious scripts through insufficient validation in the ~/class.php file.
The Impact of CVE-2021-39357
The vulnerability has a CVSS base score of 5.5 (Medium severity) and affects multi-site installations where unfiltered_html is disabled for administrators.
Technical Details of CVE-2021-39357
The technical details of the vulnerability.
Vulnerability Description
- Vulnerability Type: Stored Cross-Site Scripting (XSS)
- Attack Vector: Network
- Privileges Required: High
- CVSS Score: 5.5/10 (Medium Severity)
Affected Systems and Versions
- Product: Leaky Paywall
- Versions Affected: <= 4.16.5
Exploitation Mechanism
Attackers with administrative user access can exploit the vulnerability by injecting malicious web scripts through the ~/class.php file.
Mitigation and Prevention
Actions to prevent and mitigate the CVE-2021-39357 vulnerability
Immediate Steps to Take
- Uninstall the Leaky Paywall WordPress plugin from affected sites.
Long-Term Security Practices
- Regularly update and patch WordPress plugins and themes.
- Implement security best practices such as input validation and sanitization.
Patching and Updates
Stay informed about security advisories and install patches released by plugin vendors and developers.