Vulnerability in kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

[ Description ]Official description

The The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 3.15.5 This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for authenticated attackers, with subscriber-level access and above, to execute arbitrary shortcodes. Exploitation requires that an administrator has configured at least one Ninja Forms field with its Default Value set to the {wp:user_display_name} merge tag on a publicly accessible page; a Subscriber need only set their display_name to a shortcode string via their profile and then visit that page.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Abstracts/MergeTags…
• plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Config/MergeTagsWP.php
• plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Display/Render.php
• plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Display/Render.php
• plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/MergeTags/WP.php
• plugins.trac.wordpress.org/changeset/3749135/ninja-forms/trunk/includes/Display/Render.php
• wordpress.org/plugins/ninja-forms
• www.wordfence.com/threat-intel/vulnerabilities/id/05dccb32-e638-4929-a788-3998bc3acd75