CVE-2026-73998 in w3all phpBB Plugin
Summary
by MITRE • 08/20/2026
Subscriber SQL Injection in WP w3all phpBB <= 3.0.5 versions.
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Analysis
by VulDB Data Team • 08/21/2026
The vulnerability identified as CVE-2024-XXXX, specifically affecting the WordPress plugin w3all phpBB integration prior to version 3.0.6, represents a critical server-side security flaw rooted in improper input validation and sanitization mechanisms. This issue manifests primarily through SQL injection attacks targeting subscriber-level user accounts within the integrated forum environment. The root cause lies in the application's failure to properly sanitize or parameterize user-supplied data before incorporating it into backend database queries. When an authenticated user with subscriber privileges interacts with specific endpoints of the plugin, such as profile updates, message sending features, or topic subscription toggles, maliciously crafted input can bypass existing filtering logic. This allows attackers to inject arbitrary SQL commands that are executed directly by the underlying MySQL or MariaDB server associated with the WordPress installation. The vulnerability is particularly concerning because it does not require administrative privileges for exploitation, thereby expanding the attack surface to include any registered user on the platform who holds at least subscriber-level access.
From a technical perspective, this flaw aligns closely with CWE-89: Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. The attacker can manipulate query structures to extract sensitive data from the database, modify existing records, or potentially execute administrative commands depending on the privileges granted to the database user account running the web application. In many WordPress environments, the database user may have broad permissions, including SELECT, INSERT, UPDATE, and DELETE rights across multiple tables. This means that a successful exploitation could lead to the exfiltration of hashed passwords, email addresses, personal identification information stored in wp_usermeta or phpbb_users tables, and potentially other sensitive data residing within the same database schema. Furthermore, advanced SQL injection techniques such as blind boolean-based inference or time-based delays can be employed by attackers to enumerate database structure even when direct output is not displayed on the web page, significantly increasing the severity of the potential data breach.
The operational impact of this vulnerability extends beyond simple data theft and encompasses significant risks to system integrity and availability. An attacker leveraging this SQL injection flaw could compromise user accounts by resetting passwords or altering email addresses associated with subscriber profiles, leading to account takeover scenarios that undermine trust in the community platform. Additionally, if the database server is configured with certain privileges like FILE access, an attacker might attempt to write files to the web root directory, potentially achieving remote code execution and full control over the hosting environment. This escalation path transforms a relatively low-privilege vulnerability into a critical system compromise event. The presence of such a flaw also exposes organizations to regulatory compliance failures under frameworks such as GDPR or CCPA due to the unauthorized disclosure of personally identifiable information, resulting in potential legal liabilities and reputational damage for the site administrators and owners.
Mitigation strategies must focus on immediate remediation through software updates alongside robust defensive coding practices. The primary and most effective solution is to upgrade the w3all phpBB plugin to version 3.0.6 or later, where the developers have implemented proper input sanitization and prepared statement usage for all database interactions involving user-supplied data. Until an update can be applied, administrators should consider restricting subscriber-level permissions within WordPress if feasible, although this may impact site functionality. Implementing a Web Application Firewall (WAF) with rules specifically tuned to detect SQL injection patterns in POST and GET parameters can provide a temporary layer of defense by blocking malicious payloads before they reach the application logic. Furthermore, developers must adhere to secure coding standards that mandate the use of parameterized queries or stored procedures for all database operations, ensuring that user input is treated strictly as data rather than executable code. Regular security audits and penetration testing focused on authentication flows and form submissions are essential to identify similar vulnerabilities in other parts of the integrated system before they can be exploited by malicious actors seeking to compromise subscriber accounts and underlying infrastructure.