BackWPup <= 5.6.6 - Authenticated (Administrator+) Local File Inclusion via 'block_name' Parameter

Summary

The BackWPup plugin for WordPress is vulnerable to Local File Inclusion via the `block_name` parameter of the `/wp-json/backwpup/v1/getblock` REST endpoint in all versions up to, and including, 5.6.6 due to a non-recursive `str_replace()` sanitization of path traversal sequences. This makes it possible for authenticated attackers, with Administrator-level access and above, to include arbitrary PHP files on the server via crafted traversal sequences (e.g., `....//`), which can be leveraged to read sensitive files such as `wp-config.php` or achieve remote code execution in certain configurations. Administrators have the ability to grant individual users permission to handle backups, which may then allow lower-level users to exploit this vulnerability.

Timeline

1. Apr 14, 2026, 2:25 AM UTCCVE published
2. Apr 14, 2026, 1:01 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Apr 14, 2026, 1:03 PM UTCRecord last updated

Affected versions

• wp_media BackWPup – WordPress Backup & Restore Plugin

  through 5.6.6

References 7