CVE-2026-100155: Ninja Forms (WordPress plugin) · Code Injection
Affects Ninja Forms (WordPress plugin)Source CVE Database V5
Not known to be exploited · CVSS 6.5 Medium.
Data as of 31 Oct 2026, 06:06 UTC
Thin evidence
One scorer or none| CNA (Wordfence) | CVSS 3.1 | 6.5 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 31 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| kstoverNinja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder | Affected
| Fixed in– |
AI-suggested
Until a fix is available, users should consider restricting access to vulnerable plugin functionality or disabling the plugin if possible.
Description
Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress versions up to 3.15.5 is vulnerable to arbitrary shortcode execution. This vulnerability arises because the plugin does not properly validate input before executing shortcodes via do_shortcode, allowing unauthenticated attackers to execute arbitrary shortcodes.
References
- wordfence.com/threat-intel/vulnerabilities/id/a1cf42f7-77c6-4594-a6a4-cebf5c3558d7?source=cve (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Actions/SuccessMessage.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Actions/SuccessMessage.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/AJAX/Controllers/Submission.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Abstracts/MergeTags.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/MergeTags/Fields.php (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/AJAX/Controllers/Submission.php (opens in a new tab)
- wordpress.org/plugins/ninja-forms/ (opens in a new tab)
- plugins.trac.wordpress.org/changeset?reponame=&new=3749135%40ninja-forms%2Ftags%2F3.15.6&old=3717122%40ninja-forms%2Ftags%2F3.15.5 (opens in a new tab)