CVE-2026-28562: SQLi — Patch Guide

Overview

A critical security flaw has been identified in the wpForo Forum plugin for WordPress, allowing unauthenticated attackers to execute arbitrary SQL commands on the database. This type of vulnerability, known as SQL Injection, is one of the most severe threats to web application security.

Vulnerability Details

The vulnerability exists within the Topics::get_topics() function in wpForo version 2.4.14. The code intended to sanitize user input for database queries (esc_sql()) is ineffective in this specific scenario because it does not properly handle unquoted identifiers in the ORDER BY clause. An attacker can exploit this by manipulating the wpfob parameter in a website request. By injecting a specially crafted CASE WHEN SQL payload, the attacker can ask the database true/false questions and slowly extract sensitive information, such as administrator usernames and password hashes, directly from the WordPress database without needing to log in.

Potential Impact

The impact of this vulnerability is severe. A successful exploit could lead to:

• Full Site Compromise: Attackers can steal the administrative credentials for the WordPress site, granting them complete control.
• Data Breach: All data within the WordPress database is at risk, including user information, private forum posts, and other sensitive content.
• Website Defacement or Malware Injection: With administrative access, attackers can modify site content or install malicious software to attack visitors.

Remediation and Mitigation

Immediate action is required to protect affected websites.

Primary Action - Update Immediately: The wpForo development team has released a patched version. All users of wpForo must upgrade to the latest version immediately via the WordPress Plugins dashboard. This is the only complete solution.

Temporary Mitigation (If Update is Not Immediately Possible):

1. Web Application Firewall (WAF): Deploy or configure a WAF rule to block SQL injection patterns. This can help block exploitation attempts.
2. Disable the Plugin: As a last resort, if you cannot update and are at direct risk, consider temporarily disabling the wpForo plugin until the update can be applied. Be aware this will make your forums inaccessible.

General Best Practice:

• Always maintain a regular schedule for updating all WordPress plugins, themes, and the core installation.
• Consider using security plugins that offer intrusion detection and file integrity monitoring.

CVE Identifier: CVE-2026-28562