CVE-2021-24903 : Security Advisory and Response

A detailed overview of the GRAND FlaGallery WordPress plugin vulnerability and its impact.

Understanding CVE-2021-24903

This CVE-2021-24903 affects the Album and Image Gallery with Lightbox – FlaGallery Photo Portfolio plugin, allowing high privilege users to execute Cross-Site Scripting attacks.

What is CVE-2021-24903?

The GRAND FlaGallery WordPress plugin version <= 6.1.2 is vulnerable to stored Cross-Site Scripting due to inadequate sanitization of gallery settings.

The Impact of CVE-2021-24903

This vulnerability enables attackers, even with restricted capabilities, to launch successful Cross-Site Scripting attacks within the WordPress environment.

Technical Details of CVE-2021-24903

Insights into the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The flaw lies in the plugin's failure to properly sanitize and escape certain gallery settings, opening the door for malicious script injections.

Affected Systems and Versions

The GRAND FlaGallery plugin version <= 6.1.2 is confirmed to be susceptible to this Cross-Site Scripting vulnerability.

Exploitation Mechanism

High privilege users can exploit this flaw to inject and execute malicious scripts, circumventing security measures.

Mitigation and Prevention

Best practices to address and prevent potential risks associated with CVE-2021-24903.

Immediate Steps to Take

Ensure to update the FlaGallery Photo Portfolio plugin to a secure version post a security patch release.

Long-Term Security Practices

Implement strict input validation and output encoding procedures to fortify gallery settings against XSS attacks.

Patching and Updates

Regularly monitor and apply plugin updates promptly to mitigate potential security gaps.