Vulnerability Description
The Keep Backup Daily plugin for WordPress is vulnerable to Limited Path Traversal in all versions up to, and including, 2.1.1 via the `kbd_open_upload_dir` AJAX action. This is due to insufficient validation of the `kbd_path` parameter, which is only sanitized with `sanitize_text_field()` - a function that does not strip path traversal sequences. This makes it possible for authenticated attackers, with Administrator-level access and above, to list the contents of arbitrary directories on the server outside of the intended uploads directory.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/keep-backup-daily/tags/2.1.1/inc/func
- https://plugins.trac.wordpress.org/browser/keep-backup-daily/tags/2.1.1/inc/func
- https://plugins.trac.wordpress.org/browser/keep-backup-daily/trunk/inc/functions
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old
- https://www.wordfence.com/threat-intel/vulnerabilities/id/01984754-e332-4500-99a
FAQ
What is CVE-2026-3339?
CVE-2026-3339 is a vulnerability with a CVSS score of 2.7 (LOW). The Keep Backup Daily plugin for WordPress is vulnerable to Limited Path Traversal in all versions up to, and including, 2.1.1 via the `kbd_open_upload_dir` AJAX action. This is due to insufficient va...
How severe is CVE-2026-3339?
CVE-2026-3339 has been rated LOW with a CVSS base score of 2.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3339?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.