CVE-2026-59537 in Sender Plugin
Summary
by MITRE • 07/27/2026
Administrator SQL Injection in Sender – Newsletter, SMS and Email Marketing Automation for WooCommerce <= 2.10.22 versions.
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Analysis
by VulDB Data Team • 07/27/2026
This vulnerability exists within the Sender plugin for WooCommerce, specifically affecting versions up to and including 2.10.22, where an administrator can be subjected to a sql injection attack through improper input validation. The flaw occurs when administrative users interact with certain plugin functionalities that process user-supplied data without adequate sanitization or parameterization, allowing malicious actors to inject arbitrary sql commands into the database layer. This represents a critical security weakness that directly violates the principle of least privilege and proper input handling as outlined in cwe-89 sql injection. The vulnerability is particularly dangerous because it targets administrative functions within a widely-used ecommerce plugin, potentially enabling attackers to escalate privileges and gain complete control over the affected wordpress installation.
The technical implementation of this flaw demonstrates inadequate data sanitization practices within the plugin's backend processing mechanisms. When administrators perform actions such as managing newsletter campaigns or configuring email automation settings, the plugin fails to properly escape or parameterize user inputs before incorporating them into sql queries. This creates an environment where malicious payloads can be executed directly against the underlying database, potentially allowing for data exfiltration, unauthorized modifications, or complete system compromise. The vulnerability may manifest through various attack vectors including but not limited to campaign management interfaces, user configuration panels, or automated sending features that accept parameterized inputs from administrative users.
The operational impact of this vulnerability extends beyond simple data corruption or theft, as it provides attackers with the capability to establish persistent access points within the target environment. An attacker who successfully exploits this vulnerability could potentially modify customer data, manipulate order processing workflows, or even install backdoors for continued access. The compromised system would likely be used to conduct further attacks against connected services or to harvest sensitive customer information including personal details and financial data. This aligns with attack techniques described in the mitre att&ck framework under initial access and privilege escalation categories, particularly focusing on credential access and persistence mechanisms.
Organizations should immediately implement multiple layers of defense to protect against exploitation of this vulnerability. The primary mitigation involves updating to version 2.10.23 or later, where proper input validation and sql query parameterization have been implemented to address the injection vectors. Additionally, network segmentation strategies should be employed to limit administrative access to only necessary personnel, while implementing web application firewalls to detect and block suspicious sql injection patterns. Regular security audits of installed plugins and themes should be conducted to identify similar vulnerabilities, and database access controls should be reviewed to ensure that application accounts have minimal required privileges. The implementation of automated monitoring solutions that can detect unusual database query patterns or unauthorized administrative activities provides additional protection against exploitation attempts.