WP Database Backup <= 7.11 - Authenticated (Administrator+) OS Command Injection via 'wp_db_exclude_table' Parameter
| CVE | CVE-2026-9834 |
|---|---|
| CVSS | 7.2 (High) |
| Publicly Published | July 1, 2026 |
| Last Updated | July 2, 2026 |
| Researcher |
Irwan Kusuma
- wanjay
|
Description
The WP Database Backup – Unlimited Database & Files Backup by Backup for WP plugin for WordPress is vulnerable to OS Command Injection in all versions up to and including 7.11 via the `wp_db_exclude_table` parameter. This is due to the direct concatenation of user-supplied `$_POST['wp_db_exclude_table']` values into the `mysqldump` shell command string in the `mysqldump()` function of `includes/admin/class-wpdb-admin.php` without wrapping them in `escapeshellarg()`—every other argument in the same command (DB_USER, DB_PASSWORD, host, filename, DB_NAME) is properly escaped, making the exclude-table values the sole exception—and because the only applied filtering, `sanitize_text_field()` via `recursive_sanitize_text_field()`, strips HTML tags but leaves shell metacharacters such as `;`, `|`, `` ` ``, and `$()` intact. This makes it possible for authenticated attackers, with administrator-level access and above, to execute arbitrary operating system commands on the server, potentially enabling full remote code execution. The injection is stored: malicious values submitted through the plugin settings form are persisted to the WordPress options table via `update_option('wp_db_exclude_table')` and later retrieved with `get_option()` and passed unsanitized to `shell_exec()` whenever a backup operation runs.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
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Vulnerability Details for WP Database Backup – Unlimited Database & Files Backup by Backup for WP
| Software Type | Plugin |
|---|---|
| Software Slug | wp-database-backup (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 7.12, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in WP Database Backup – Unlimited Database & Files Backup by Backup for WP
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