CVE-2026-89305 in paymendo Plugin
Summary
by MITRE • 10/11/2026
The paymendo WordPress plugin through 1.1 does not properly sanitize and escape a parameter before using it in a SQL query, allowing any authenticated user to perform SQL injection attacks.
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Analysis
by VulDB Data Team • 10/11/2026
The vulnerability identified within the PayMendo WordPress plugin version 1.1 represents a critical security flaw rooted in insufficient input validation and output encoding mechanisms. Specifically, the application fails to properly sanitize or escape a specific parameter prior to its inclusion in a Structured Query Language statement executed against the backend database. This oversight creates an avenue for authenticated attackers to manipulate the intended logic of the SQL query by injecting malicious code segments through user-controllable inputs. The core technical deficiency lies in the absence of prepared statements or rigorous type checking, which are standard practices for preventing injection-based attacks in modern web application development frameworks and content management systems like WordPress.
From a classification perspective, this vulnerability aligns with CWE-89, commonly known as SQL Injection. This category encompasses any software that constructs SQL commands using externally influenced input without adequate neutralization of special elements. In the context of the PayMendo plugin, the lack of proper escaping allows an attacker to alter the structure of the database query. By injecting syntactically correct but maliciously crafted strings, an adversary can bypass authentication checks, extract sensitive data from other tables within the same database schema, modify or delete existing records, and potentially execute administrative operations on the underlying database server depending on the privileges assigned to the database user account used by the web application.
The operational impact of this vulnerability is severe due to its accessibility requirements. While it requires authentication, meaning an attacker must possess valid credentials for a WordPress user account with at least subscriber-level access or higher, many sites suffer from weak password policies or credential stuffing attacks that can compromise such accounts relatively easily. Once authenticated, the ability to perform SQL injection grants the attacker significant leverage over the integrity and confidentiality of the site's data. This could lead to the exposure of customer payment information stored by the plugin, user personal details, administrative credentials hashed in the WordPress database, or even full server compromise if the database service runs with elevated privileges that allow file system access via specific SQL commands like LOAD_FILE or INTO OUTFILE.
In terms of threat actor behavior and detection, this activity corresponds to techniques found within the MITRE ATT&CK framework, particularly T1059 Command Scripting for executing injected payloads and T1213 Data from Information Repositories for exfiltrating data via SQL queries. Security monitoring systems should look for anomalous database query patterns originating from web server processes that contain common injection signatures such as UNION SELECT statements, boolean-based blind indicators like OR 1=1, or time-delay functions designed to confirm the presence of a vulnerability through response timing differences.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The primary solution is for plugin developers to release an updated version that implements parameterized queries or prepared statements using database abstraction layers provided by WordPress such as $wpdb->prepare(). This ensures that user input is treated strictly as data rather than executable code, effectively neutralizing injection attempts regardless of the content entered. For site administrators unable to immediately update the plugin due to compatibility concerns, temporary mitigations include restricting access to the affected endpoints through web application firewall rules that block known SQL injection payloads and enforcing strict role-based access control policies to limit which user roles can interact with vulnerable features. Additionally, implementing multi-factor authentication for all administrative accounts reduces the likelihood of credential compromise leading to exploitation. Regular security audits and code reviews focusing on database interaction layers are essential to prevent similar vulnerabilities in future updates or other plugins integrated into the WordPress ecosystem.