CVE-2026-3577: Fahadmahmood Keep Backup Daily

Medium severity, CVSS 4.4. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Fahadmahmood Keep Backup Daily: up to and including 2.1.2

Published 2026-03-21. Last modified 2026-06-17.