CVE-2026-84279: Fancy Product Designer <= 6.5.2 - Unauthenticated Stored Cross-Site Scripting via 'output_format' Parameter via Pro Export Print Job
The Fancy Product Designer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'outputformat' parameter in all versions up to, and including, 6.5.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the Pro Export/Genius feature to be enabled on the site, as the vulnerable fpdprexport AJAX action is only registered when that feature is active.
Affected Software
Event History
Frequently Asked Questions
Which sites are exposed to this issue?
Sites using Fancy Product Designer version 6.5.2 or earlier are exposed only if the Pro Export/Genius feature is enabled. The vulnerable fpd_pr_export AJAX action is registered only when that feature is active.
Does exploitation require an authenticated WordPress account or user interaction?
No. An attacker can submit the malicious output_format parameter without authentication, and no interaction is required to store the payload. The injected script executes later when a user accesses the affected page.
What can be done if updating is not immediately possible?
Disable the Pro Export/Genius feature to prevent registration of the vulnerable fpd_pr_export AJAX action. This mitigation is supported by the vulnerability details because the affected action is available only while that feature is enabled.
How can administrators assess whether their site may be affected?
Check whether Fancy Product Designer is at version 6.5.2 or earlier and whether Pro Export/Genius is enabled. Also review pages or print-job-related content for unexpected values or script content associated with the output_format parameter.