CVE-2026-61996 in MLS On The Fly Plugin
Summary
by MITRE • 10/29/2026
Subscriber SQL Injection in MLS On The Fly <= 1.8.1.5 versions.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified as a Subscriber SQL Injection flaw within the MLS On The Fly plugin, affecting versions up to and including 1.8.1.5, represents a critical security deficiency rooted in inadequate input validation and sanitization mechanisms. This specific weakness allows an attacker to inject malicious Structured Query Language code into application-level inputs that are subsequently concatenated with database queries without proper escaping or parameterization. The core technical flaw lies in the handling of subscriber-related data, where user-supplied values such as email addresses, names, or subscription preferences are directly incorporated into SQL statements executed by the backend database management system. Because these inputs are not sufficiently sanitized against special characters like single quotes, semicolons, or comment sequences, an adversary can manipulate the structure of the underlying query to alter its intended logic. This type of vulnerability is classically categorized under CWE-89, which defines Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. The presence of this flaw indicates that the plugin fails to implement prepared statements or robust input filtering strategies required by modern secure coding standards to prevent such manipulations.
The operational impact of exploiting this vulnerability is severe and multifaceted, primarily centering on unauthorized access to sensitive data stored within the WordPress database. An attacker leveraging this SQL injection vector can extract confidential information including user credentials, personal subscriber details, payment history if applicable, and other proprietary content managed by the MLS system. Beyond simple data exfiltration, skilled attackers may utilize advanced techniques such as UNION-based injections or blind boolean-based inference to enumerate database schema structures, potentially leading to full database compromise. In more sophisticated attack scenarios involving specific database configurations like MySQL with file privileges enabled, this vulnerability could theoretically allow for remote code execution through writing malicious files to the server filesystem via SQL commands like INTO OUTFILE. This expands the threat landscape from mere data theft to complete system takeover, enabling further lateral movement within the network infrastructure hosting the WordPress instance. The risk is particularly acute because subscriber data often contains personally identifiable information, making such breaches subject to strict regulatory penalties under frameworks like GDPR or CCPA if exposed.
From a tactical perspective, this vulnerability aligns with several techniques documented in the MITRE ATT&CK framework for enterprise security. Specifically, it corresponds to T1190 Exploit Public-Facing Application and T1059 Command and Scripting Interpreter when considering potential downstream effects like code execution. The exploitation typically requires no authentication if the vulnerable endpoint is publicly accessible, or low-privilege access if restricted areas are involved, fitting into initial access vectors where attackers target web applications to gain a foothold in an organization's digital environment. Attackers often automate these exploits using tools designed for SQL injection reconnaissance and data extraction, making it a high-risk vulnerability that demands immediate attention due to its prevalence and ease of exploitation against unpatched systems. The lack of proper input validation serves as the primary enabler for this attack chain, allowing malicious payloads to bypass application-level security controls and interact directly with the database engine.
To mitigate this risk effectively, administrators must immediately upgrade the MLS On The Fly plugin to a version newer than 1.8.1.5 where the developer has presumably addressed these input handling deficiencies. Until an update is available or if no patch exists, implementing Web Application Firewall rules can provide a temporary layer of defense by detecting and blocking common SQL injection patterns in HTTP requests targeting subscriber endpoints. Additionally, developers should review any custom code interacting with this plugin to ensure that all database queries utilize parameterized statements or prepared queries rather than string concatenation for variable insertion. Regular security audits focusing on input validation across all user-facing forms are essential to prevent similar vulnerabilities from persisting within the application logic. Furthermore, applying the principle of least privilege to the database account used by WordPress ensures that even if an injection succeeds, the potential damage is contained by restricting permissions such as file write access or administrative command execution capabilities at the database level.