WP Duplicate <= 1.1.8 - Authenticated (Subscriber+) Arbitrary File Upload via 'process_add_site' AJAX Action
Affected versions: *-1.1.8
Vulnerability type: CWE-862 Missing Authorization
Affected software, patched versions and attribution
The WP Duplicate plugin for WordPress is vulnerable to Missing Authorization leading to Arbitrary File Upload in all versions up to and including 1.1.8. This is due to a missing capability check on the `process_add_site()` AJAX action combined with path traversal in the file upload functionality. This makes it possible for authenticated (subscriber-level) attackers to set the internal `prod_key_random_id` option, which can then be used by an unauthenticated attacker to bypass authentication checks and write arbitrary files to the server via the `handle_upload_single_big_file()` function, ultimately leading to remote code execution.
WP Duplicate – WordPress Migration Plugin
Affected versions: *-1.1.8
Patched versions: 1.1.9
Researcher credit: Athiwat Tiprasaharn (Jitlada)
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- Published
- February 5, 2026
- CVSS
- 8.8