CVE-2026-100151: Ninja Forms (WordPress plugin) · Cross-site Scripting
Affects Ninja Forms (WordPress plugin)Source CVE Database V5
Not known to be exploited · CVSS 6.1 Medium.
Data as of 31 Oct 2026, 09:51 UTC
Thin evidence
One scorer or none| CNA (Wordfence) | CVSS 3.1 | 6.1 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 avoid clicking suspicious links that include query parameters targeting this plugin. Monitoring vendor channels for updates and applying patches promptly once released is recommended.
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 a reflected DOM-based cross-site scripting (XSS) flaw. This vulnerability arises from insufficient input sanitization and output escaping of a 'querystring:<key>' URL parameter, allowing unauthenticated attackers to inject arbitrary scripts. The attack exploits the server's resolution of the {field:*} placeholder, causing the client-side code to reconstruct field content from unsanitized query parameters, potentially executing malicious scripts when a user clicks a crafted link.
References
- wordfence.com/threat-intel/vulnerabilities/id/82ace2e3-1120-4be9-a7c6-b64590c8a35f?source=cve (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/assets/js/min/front-end.js (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Templates/fields-html.html (opens in a new tab)
- plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/MergeTags/Other.php (opens in a new tab)
- wordpress.org/plugins/ninja-forms/ (opens in a new tab)
- plugins.trac.wordpress.org/changeset/3749135/ninja-forms/trunk/assets/js/min/front-end.js (opens in a new tab)