The JetBackup WordPress plugin before 3.1.23.5 does not perform its multisite authorisation check before serving backup archives and job logs, allowing an administrator of the network's main site who is not a Super Admin to download a full backup of the entire network, including every site's data and the shared webroot.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in JetBackup JetBackup – WP Backup, Migrate & Restore plugin <= 1.6.9.0 versions.

The JetBackup – Backup, Restore & Migrate plugin for WordPress is vulnerable to Path Traversal leading to Arbitrary Directory Deletion in versions up to and including 3.1.19.8. This is due to insufficient input validation on the fileName parameter in the file upload handler. The plugin sanitizes the fileName parameter using sanitizetextfield(), which removes HTML tags but does not prevent path traversal sequences like '../'. The unsanitized filename is then directly concatenated in Upload::getFileLocation() without using basename() or validating the resolved path stays within the intended directory. When an invalid file is uploaded, the cleanup logic calls dirname() on the traversed path and passes it to Util::rm(), which recursively deletes the entire resolved directory. This makes it possible for authenticated attackers with administrator-level access to traverse outside the intended upload directory and trigger deletion of critical WordPress directories such as wp-content/plugins, effectively disabling all installed plugins and causing severe site disruption.

The JetBackup – WP Backup, Migrate & Restore plugin for WordPress is vulnerable to unauthorized back-up location changes in versions up to, and including 1.4.1 due to a lack of proper capability checking on the backupguardclouddropbox, backupguardcloudgdrive, and backupguardcloudoneDrive functions. This makes it possible for authenticated attackers, with minimal permissions, such as a subscriber to change to location of back-ups and potentially steal sensitive information from them.

The JetBackup – WP Backup, Migrate & Restore plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including 1.3.9. This is due to missing nonce validation on the backupguardgetimportbackup() function. This makes it possible for unauthenticated attackers to upload arbitrary files to the vulnerable site's server via a forged request, granted they can trick a site's administrator into performing an action such as clicking on a link.

The JetBackup – WP Backup, Migrate & Restore plugin for WordPress is vulnerable to sensitive information disclosure in versions up to, and including, 1.4.0 due to a lack of proper capability checking on the backupguardgetmanualmodal function called via an AJAX action. This makes it possible for subscriber-level attackers, and above, to invoke the function and obtain database table information.

The JetBackup WordPress plugin before 2.0.9.9 doesn't use index files to prevent public directory listing of sensitive directories in certain configurations, which allows malicious actors to leak backup files.