WordPress · Keep Backup Daily · CVE-2026-3577
**Name of the Vulnerable Software and Affected Versions**
Keep Backup Daily plugin for WordPress versions up to and including 2.1.2
**Description**
The Keep Backup Daily plugin for WordPress is susceptible to a Stored Cross-Site Scripting issue. This occurs because of inadequate input sanitization and output escaping. Specifically, the backup title alias, represented by the `val` parameter, within the `update kbd bkup alias` AJAX action is not properly handled. While `sanitize text field()` removes HTML tags during saving, it fails to encode double quotes. Consequently, backup titles are displayed in HTML attribute contexts without using `esc attr()`, allowing authenticated attackers with Administrator-level access or higher to inject malicious web scripts. These scripts will execute whenever another administrator views the backup list page.
**Recommendations**
Update the Keep Backup Daily plugin to a version later than 2.1.2.