WC Fields Factory < 4.1.11 - Contributor+ Arbitrary Post Cloning and Private Content Disclosure

The WC Fields Factory WordPress plugin before 4.1.11 does not properly restrict access to, or verify a nonce for, a post-cloning action, allowing Contributor-level users and above to duplicate arbitrary posts of any type or status, including other users' private or draft content, and gain read access to the resulting copy.