WP Duplicate Plugin up to 1.1.8 on WordPress process_add_site authorization

Summaryinfo

A vulnerability classified as critical was found in WP Duplicate Plugin up to 1.1.8 on WordPress. Impacted is the function process_add_site. Such manipulation leads to authorization. This vulnerability is traded as CVE-2026-1499. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in WP Duplicate Plugin up to 1.1.8 on WordPress and classified as critical. Affected by this issue is the function process_add_site. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-1499. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/06/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Name

• WP Duplicate Plugin

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7
• 1.1.8

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