CVE-2021-24516 Explained : Impact and Mitigation

PlanSo Forms WordPress plugin version 2.6.3 and below are vulnerable to Authenticated Stored Cross-Site Scripting due to improper handling of form titles. This allows high privilege users to execute XSS payloads, leading to security risks.

Understanding CVE-2021-24516

This CVE identifies a security vulnerability in the PlanSo Forms WordPress plugin that could be exploited by authenticated users to perform cross-site scripting attacks.

What is CVE-2021-24516?

The PlanSo Forms WordPress plugin version 2.6.3 and earlier fail to properly sanitize form titles. This oversight permits high-privileged users, like administrators, to inject malicious code, enabling Authenticated Stored Cross-Site Scripting.

The Impact of CVE-2021-24516

The vulnerability poses a significant security risk as it allows attackers with legitimate access to inject harmful scripts, potentially compromising user data and system integrity. Admins should address this issue promptly to prevent exploitation.

Technical Details of CVE-2021-24516

This section details the technical aspects of the CVE, outlining the vulnerability, affected systems, and exploit mechanism.

Vulnerability Description

The flaw originates from the plugin's failure to properly escape form titles, allowing users with high privileges to insert XSS payloads that execute when the form is displayed, leading to an Authenticated Stored Cross-Site Scripting vulnerability.

Affected Systems and Versions

PlanSo Forms WordPress plugin versions up to 2.6.3 are impacted by this vulnerability. Users with outdated installations are at risk of exploitation.

Exploitation Mechanism

Attackers, with authenticated access, can manipulate form titles to contain malicious scripts. When these forms are rendered, the injected code executes in the context of other users, potentially leading to data theft or system compromise.

Mitigation and Prevention

To safeguard systems from CVE-2021-24516 and similar vulnerabilities, immediate actions, and long-term security practices are essential.

Immediate Steps to Take

Users should update the PlanSo Forms plugin to the latest version to patch the vulnerability. Additionally, restrict access privileges and monitor user inputs to prevent malicious injections.

Long-Term Security Practices

Implement strict input validation and output filtering mechanisms in plugin development. Regular security audits and user input sanitization can help mitigate XSS risks.

Patching and Updates

Stay informed about security advisories for the PlanSo Forms plugin and apply patches promptly. Regularly update plugins and maintain a proactive security posture to prevent future vulnerabilities.