CVE-2021-24976 Explained : Impact and Mitigation

The Smart SEO Tool WordPress plugin before version 3.0.6 is vulnerable to Reflected Cross-Site Scripting due to improper sanitization of user input.

Understanding CVE-2021-24976

This CVE identifies a security issue in the Smart SEO Tool WordPress plugin that could allow attackers to execute malicious scripts in the context of a user's browser.

What is CVE-2021-24976?

The vulnerability in the Smart SEO Tool plugin allows for Reflected Cross-Site Scripting (XSS) attacks by not properly filtering user-supplied data.

The Impact of CVE-2021-24976

Exploitation of this vulnerability could lead to unauthorized access, data theft, defacement, and other malicious activities on the affected WordPress sites.

Technical Details of CVE-2021-24976

The following technical details outline the specifics of the CVE.

Vulnerability Description

The issue arises from inadequate sanitization and escaping of user input when the TDK optimization setting is activated, enabling attackers to inject and execute malicious scripts.

Affected Systems and Versions

Product: Smart SEO Tool – SEO优化插件
Vendor: Unknown
Versions Affected: < 3.0.6

Exploitation Mechanism

By crafting a malicious link containing script payloads and enticing a logged-in user to click on it, an attacker could trigger the XSS vulnerability.

Mitigation and Prevention

To address CVE-2021-24976, users and administrators are advised to take the following steps:

Immediate Steps to Take

Update the Smart SEO Tool plugin to version 3.0.6 or higher to mitigate the vulnerability.
Disable the TDK optimization setting until the plugin is updated.

Long-Term Security Practices

Regularly monitor for security advisories and updates related to WordPress plugins.
Educate users and administrators about the dangers of clicking on suspicious links.

Patching and Updates

Apply security patches promptly and maintain updated versions of all installed plugins to avoid known vulnerabilities.