CVE-2026-3577
Keep Backup Daily <= 2.1.2 - Authenticated (Admin+) Stored Cross-Site Scripting via Backup Title
- State
- Published
- Severity
- 4.4 Medium
- Published
- Mar 20, 2026
- Updated
- Apr 8, 2026
- Reserved
- Mar 4, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.4 Medium | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N | Wordfence |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Keep Backup Dailyfahadmahmood |
|
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/18a4fa4b-5c99-4347-8b34-e49f7e0972be?source=cve
- https://plugins.trac.wordpress.org/browser/keep-backup-daily/tags/2.1.1/inc/functions.php#L626
- https://plugins.trac.wordpress.org/browser/keep-backup-daily/trunk/inc/functions.php#L626
- https://plugins.trac.wordpress.org/browser/keep-backup-daily/tags/2.1.1/inc/kbd_cron.php#L505
- https://plugins.trac.wordpress.org/browser/keep-backup-daily/trunk/inc/kbd_cron.php#L505
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3481587%40keep-backup-daily&new=3481587%40keep-backup-daily&sfp_email=&sfph_mail=
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