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CVE-2026-9834

HIGH 7.2 CVSS 3.1
Published
July 2, 2026
Last modified
July 2, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-77
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

Affected WordPress components

  • WP Database Backup – Unlimited Database & Files Backup by Backup for WP Plugin · wp-database-backup
    Confirmed match Active
    Up to and including 7.11
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • databasebackup WP Database Backup – Unlimited Database & Files Backup by Backup for WP — Up to and including 7.11

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpdb-admin.php#L216
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpdb-admin.php#L2644
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpdb-admin.php#L2654
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpdb-admin.php#L216
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpdb-admin.php#L2644
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpdb-admin.php#L2654
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3574273%40wp-database-backup&new=3574273%40wp-database-backup&sfp_email=&sfph_mail=
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/0a97a217-b00b-4268-a472-8d62ae1d18e3?source=cve
  • nvd.nist.gov Official NVD record