External risk intelligence

wpForo Forum Unauthenticated SQL Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-40798

An unauthenticated SQL injection vulnerability exists in a popular forum plugin, potentially allowing attackers to access sensitive database information without authentication. This issue could lead to unauthorized data disclosure if the plugin is present and reachable. Confirmation of its use and impact is advised.

4Halo Surface Signal

SQL Injection

External exposure likelihood

Halo Surface Signal score for CVE-2026-40798

This vulnerability affects a WordPress forum plugin. Such plugins are typically installed on web servers to provide public-facing community discussion features, making the affected code path reachable from the public internet by design in standard deployments.

PCI scan relevance

PCI Relevance for CVE-2026-40798

Yes

CVE-2026-40798 — Halo PCI Relevance: Yes. Under typical PCI ASV external scan criteria, this issue may be flagged for scan prioritization.

This unauthenticated SQL injection vulnerability in wpForo Forum can lead to an ASV scan failure.

Scan-prioritization guidance only—not a PCI DSS certification or ASV attestation.

Horizon Alert

Summary of the vulnerability and why it matters

A critical security flaw has been identified in a widely used forum plugin for websites, potentially exposing user data. This unauthenticated SQL injection vulnerability allows attackers to access and manipulate information stored within the forum's database without needing any login credentials. The main concern is to confirm if this specific plugin is in use and, if so, to what extent.

  • Unauthenticated data access in a forum plugin.
  • Widespread use increases potential exposure.
  • Confirm relevance and understand potential data exposure.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker can exploit this vulnerability by sending specially crafted SQL commands over the network to the affected forum plugin. This could occur if the plugin's input handling does not properly sanitize user-supplied data before using it in database queries. Successful exploitation may allow an attacker to access sensitive data or disrupt the forum's operations.

  • Requires network access, no authentication needed.
  • Triggered by sending malicious SQL input.
  • Risk of unauthorized data access.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to inject malicious SQL code into the application. When supported by the advisory, this could potentially lead to the disclosure of sensitive database information.

  • Database information.
  • SQL injection via network requests.
  • Unauthorized access to data.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This unauthenticated SQL injection vulnerability in wpForo Forum affects public-facing web applications. Responsibility likely falls to the web application owner and the platform or infrastructure team managing the web server environment. The immediate first step is to confirm the presence and reachability of the affected plugin, assess its criticality to business operations, and identify the accountable owner to plan remediation.

  • Application owners should own this issue.
  • Verify plugin presence and external reachability.
  • Plan remediation and vendor coordination.

Frequently asked questions

What is the wpForo Forum plugin?

wpForo Forum is a WordPress plugin used to add community discussion boards and forums to websites. It integrates directly into the WordPress ecosystem, allowing site owners to host user-generated content and manage member interactions. Because it is a plugin, it runs on the site's web server and interacts heavily with the underlying database to store posts, user profiles, and forum settings.

How does CVE-2026-40798 cause a security weakness?

This vulnerability is classified as a SQL Injection (CWE-89). It occurs when the plugin fails to properly clean or filter data provided by users before including it in database commands. Because the application does not validate this input, an attacker can insert their own database queries, tricking the system into revealing or modifying information that should remain private.

What triggers the vulnerability in wpForo Forum?

An attacker triggers this bug by sending a specially crafted request containing malicious SQL commands over the network to the plugin. Since the flaw is unauthenticated, no user account or login is required to initiate the request. The vulnerability is specifically triggered by how the plugin processes inputs; standard, legitimate user interactions that do not involve malformed SQL queries will not trigger this security flaw.

Is my website at risk from this CVE?

According to Halo Surface Signal, this vulnerability is likely relevant if your site uses the affected wpForo Forum plugin. Because forum plugins are designed for community discussions, they are typically exposed to the public internet by default. If your instance is reachable by the public, it is considered external-facing, which increases the likelihood that an attacker could reach the vulnerable code path.

What should I do if I use this plugin?

Your first step is to verify whether the wpForo Forum plugin is installed and active on your web server. Determine if the forum is accessible to the public internet, as this influences the urgency of your response. Coordinate with your website administrator or technical team to confirm the plugin version and monitor for official updates or patches from the plugin developer to address the SQL injection flaw.

References