CVE-2026-17555 in WPvivid Plugin
Summary
by MITRE • 08/01/2026
The WPvivid Backup & Migration plugin for WordPress is vulnerable to SQL Injection via the export_data parameter in versions up to, and including, 0.9.131. This is due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. The values are received in prepare_export_post(), passed through sanitize_text_field() and stripslashes(), JSON-decoded, and the attacker-controlled JSON object keys are collected as $posts_ids without integer casting. They are stored in the export task options and later joined with commas and interpolated directly into a `WHERE ID IN (...)` clause inside a $wpdb->get_results() call in export_post_to_xml() (unquoted, numeric context), with no $wpdb->prepare() or esc_sql(). This makes it possible for authenticated attackers, with Administrator-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.
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Analysis
by VulDB Data Team • 08/01/2026
The WPvivid Backup & Migration plugin for WordPress contains a critical SQL injection vulnerability affecting versions up to and including 0.9.131. This vulnerability stems from inadequate input sanitization and improper query preparation practices within the plugin's export functionality. The flaw exists in the prepare_export_post() function where user-supplied parameters undergo insufficient validation and escaping processes, creating an exploitable path for malicious actors to manipulate database queries through crafted input values.
The technical implementation of this vulnerability begins when the export_data parameter is processed through sanitize_text_field() and stripslashes() functions which do not provide adequate protection against SQL injection attacks. Following this initial sanitization, the JSON-decoded data contains attacker-controlled object keys that are collected as $posts_ids without proper integer casting or type validation. These unvalidated identifiers are then stored in export task options and subsequently interpolated directly into a WHERE ID IN (...) clause within the export_post_to_xml() function. The critical failure occurs when these values are passed to $wpdb->get_results() without proper preparation using $wpdb->prepare() or esc_sql() functions, allowing malicious SQL commands to be executed alongside legitimate database queries.
This vulnerability represents a classic example of CWE-89 SQL Injection, specifically manifesting as an authenticated attack vector requiring administrator-level privileges or higher. The operational impact of this flaw is severe as it enables attackers to extract sensitive information from the WordPress database through carefully crafted SQL injection payloads. Attackers can leverage this vulnerability to access user credentials, personal data, configuration settings, and other confidential information stored within the database. The attack requires minimal privileges since only administrative access is needed to trigger the vulnerable code path, making it particularly dangerous in environments where administrator accounts may be compromised.
The exploitation process follows established patterns described in MITRE ATT&CK framework under technique T1078 Valid Accounts and T1213 Data from Information Repositories. The vulnerability's impact extends beyond simple data extraction to potentially enable further compromise of the WordPress installation through privilege escalation or lateral movement within the affected system. Organizations using WPvivid Backup & Migration plugin versions prior to 0.9.132 should immediately implement mitigations including plugin updates, input validation hardening, and monitoring for suspicious administrative activities. Additionally, implementing proper parameter binding techniques and avoiding direct string interpolation in SQL queries would prevent similar vulnerabilities from occurring in the future.
The root cause of this vulnerability demonstrates poor secure coding practices that violate fundamental database security principles. Modern WordPress development should consistently employ $wpdb->prepare() methods for all dynamic query construction to prevent SQL injection attacks. The lack of proper type casting and input validation creates a dangerous attack surface where user-controllable data can directly influence query execution flow, making the system vulnerable to complex injection payloads that could potentially execute arbitrary database commands or retrieve unauthorized information through UNION-based queries.