BackUpWordPress <= 3.14 - Authenticated (Subscriber+) Missing Authorization to Backup Directory File Deletion via hmbkp_dismiss_error AJAX Action
- ID
- WPSEC-2026-2647
- Plugin
- BackUpWordPress (backupwordpress)
- Affected
- from 1.6.2 before 3.15
- Remediation
- Update to 3.15 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
- Weakness
- CWE-862
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-06
- Attack surface
- BackUpWordPress on WPSec AttackSurface
- Fix released
- Published
Description
The BackUpWordPress plugin for WordPress is vulnerable to unauthorized file deletion via the hmbkp_dismiss_error AJAX action in all versions up to, and including, 3.14, due to a missing capability check and missing nonce verification in the dismiss_error() function. The handler runs the backup directory cleanup routine, which deletes every file in the backups directory except .zip archives, index.html, the .files manifest and '-running' status files, and then clears the plugin's notices. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete files in the backups directory, including the .htaccess file that protects stored backup archives and in-progress database dumps. This can break running backups and weaken the protection of the backup archives.
References
- https://wpsec.com/vuln/WPSEC-2026-2647/
- https://plugins.svn.wordpress.org/backupwordpress/tags/3.15/
- https://wordpress.org/plugins/backupwordpress/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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