WP Duplicate <= 1.1.8 - Authenticated (Subscriber+) Arbitrary File Upload via 'process_add_site' AJAX Action

Missing Authorization
CVE CVE-2026-1499
CVSS Critical (9.8)
Publicly Published February 5, 2026
Last Updated February 9, 2026
Researcher Athiwat Tiprasaharn (Jitlada)
Description

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.

References

1 affected software package

Software Type Plugin
Software Slug local-sync (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 1.1.8
Patched Version
  • 1.1.9
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