Fluent Forms Pro Add On Pack <= 6.1.17 - Missing Authorization to Unauthenticated Arbitrary Attachment Deletion

Missing Authorization
CVE CVE-2026-2899
CVSS Medium (6.5)
Publicly Published March 4, 2026
Last Updated March 5, 2026
Researcher Prickly Cactus
Description

The Fluent Forms Pro Add On Pack plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 6.1.17. This is due to the `deleteFile()` method in the `Uploader` class lacking nonce verification and capability checks. The AJAX action is registered via `addPublicAjaxAction()` which creates both `wp_ajax_` and `wp_ajax_nopriv_` hooks. This makes it possible for unauthenticated attackers to delete arbitrary WordPress media attachments via the `attachment_id` parameter. Note: The researcher described file deletion via the `path` parameter using `sanitize_file_name()`, but the actual code uses `Protector::decrypt()` for path-based deletion which prevents exploitation. The vulnerability is exploitable via the `attachment_id` parameter instead.

References

1 affected software package

Software Type Plugin
Software Slug fluentformpro (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 6.1.17
Patched Version
  • 6.1.18
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