External risk intelligence

Participants Database Unauthenticated SQL Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-59525

This vulnerability affects a WordPress plugin, which is typically deployed as a public-facing web application. Since the vulnerability involves an unauthenticated SQL injection within a web-accessible database plugin, the attack surface is commonly exposed to the internet in standard web deployments.

SQL Injection

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory describes a critical security issue in a widely used WordPress plugin that allows unauthorized access to sensitive participant data. The vulnerability, an unauthenticated SQL injection, could potentially expose confidential information without any prior authentication, posing a significant risk to data privacy and integrity. The primary concern at this level is to confirm if this specific plugin and version are in use within our organization.

  • Unauthenticated data access flaw in a popular plugin.
  • Potential for sensitive information exposure.
  • Confirm usage and exposure for relevant systems.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending specially crafted input to the Participants Database plugin, which does not require authentication. This malicious input targets a weakness in how the plugin handles database queries, potentially allowing the attacker to read sensitive information from the database.

  • No authentication needed.
  • Sends malicious input to plugin.
  • Database information disclosure.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to inject malicious SQL commands into the Participants Database, potentially leading to unauthorized access to database contents when the plugin is exposed to the internet. The extent of data exposure depends on the database schema and user permissions.

  • Sensitive database records.
  • Via unauthenticated network requests.
  • Unauthorized access to information.

Operational Fix

Recommended remediation, mitigation, and detection steps

Unauthenticated SQL injection in Participants Database versions prior to 2.7.8.3 requires immediate attention. Owners of web applications using this plugin should prioritize identifying all instances, assessing their exposure and criticality, and coordinating with their respective platform or infrastructure teams to plan remediation. Vendor coordination may be necessary if the plugin is managed by a third party or requires vendor-provided patches.

  • Application owners and platform teams.
  • Verify plugin reachability and business impact.
  • Plan risk-based remediation with vendor coordination.

Supplementary metadata

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

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Frequently asked questions

What is the Participants Database plugin?

Participants Database is a WordPress plugin used to manage and display lists of people or records on a website. It functions as a data management tool, allowing site administrators to create custom forms and databases to track information about individuals. By storing this data directly within the WordPress environment, it serves as a central hub for organizational records that may be accessed or submitted by visitors to the site.

What does SQL injection mean for CVE-2026-59525?

This vulnerability falls under the Improper Neutralization of Special Elements used in an SQL Command weakness class (CWE-89). It means the plugin does not properly filter or sanitize the data it receives from users before including that data in database queries. Because of this failure, an attacker can manipulate the underlying database commands, tricking the plugin into revealing sensitive records that it was never intended to display or share.

How can an attacker trigger this vulnerability?

An attacker triggers this flaw by sending specially crafted, malicious input to the plugin through network requests. Crucially, the plugin does not require any login or administrative credentials to process these requests, allowing the attack to occur from an unauthenticated state. The vulnerability is not triggered by standard site navigation or legitimate user data entry, but specifically through inputs designed to disrupt and redirect the plugin’s intended database operations.

Is my site at risk according to Halo Surface Signal?

Halo Surface Signal notes that because this vulnerability exists within a WordPress plugin, it is typically deployed as part of a public-facing web application. Since the plugin is meant to be accessible to web users, your instance is likely exposed to the internet. If your WordPress site uses this plugin and is reachable by the public, the attack surface is present, making the application a potential target for remote, unauthenticated queries against your database.

What should I do if I run this plugin?

First, verify if your environment is running the affected plugin version 2.7.8.3 or older. Once identified, evaluate how the data managed by the plugin is being used and its impact on your organization. Work with your web management or infrastructure teams to coordinate a plan for remediation, which typically involves checking for available vendor updates or patches. Do not wait for public reports of abuse to begin verifying your internal plugin inventory.

References

Sources and related resources

Primary sources: NVD, CVE.org.

NVDPublished