The The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to…
CVE-2026-101326
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 doshortcode. 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:userdisplayname} merge tag on a publicly accessible page; a Subscriber need only set their displayname to a shortcode string via their profile and then visit that page.
Assessment
- CVSS
- 5.4 (v3.1)
- Severity
- Medium
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 31 October 2026
- Last updated
- 31 October 2026
- Affected
- kstover
- Assigner
- Wordfence
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
At the source
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/05dccb32-e638-4929-a788-3998bc3acd75?source=cve
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/MergeTags/WP.php#L189
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Display/Render.php#L278
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Display/Render.php#L268
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Config/MergeTagsWP.php#L128
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Abstracts/MergeTags.php#L94
- https://wordpress.org/plugins/ninja-forms/
- https://plugins.trac.wordpress.org/changeset/3749135/ninja-forms/trunk/includes/Display/Render.php
Query this programmatically
Agents can read this through the MCP endpoint, or over HTTP:
curl https://cve.zerocrew.in/api/cve/CVE-2026-101326