The Keep Backup Daily plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the backup title alias (`val` parameter) in the `update_kbd_bkup_alias` AJAX action in all versions up to, and including, 2.1.2. This is due to insufficient input sanitization and output escaping. While `sanitize_text_field()` strips HTML tags on save, it does not encode double quotes. The backup titles are output in HTML attribute contexts without `esc_attr()`. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts via attribute injection that will execute whenever another administrator views the backup list page.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Keep Backup Daily Plugin | — | Update keep-backup-daily plugin to version 2.1.3, or a newer patched version | Apr 30, 2026 | Mar 20, 2026 |
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