CVE-2026-100151 json
Ninja Forms <= 3.15.5 - Reflected DOM-Based Cross-Site Scripting via 'querystring:<key>' URL Parameter
published 2026-10-31 8 d ago modified 2026-11-02 6 d ago also EUVD-2026-114704
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 13%
- public exploits
- 0
- none known
Summary
The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to Reflected DOM-Based Cross-Site Scripting via 'querystring:<key>' URL Parameter in all versions up to, and including, 3.15.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. This bypass is triggered when an attacker supplies a matching field:<key> URL parameter that causes the server to fully resolve the {field:*} placeholder, forcing the client-side else-branch to abandon the server-sanitized value and reconstruct field content from the raw query string.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 d ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected products
- kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
- wordfence.com /threat-intel/vulnerabilities/id/82ace2e3-1120-4be9-a7c6-b64590c8a35f?source=cve
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/assets/js/min/front-end.js
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/Templates/fields-html.html#L2
- plugins.trac.wordpress.org /browser/ninja-forms/tags/3.15.4/includes/MergeTags/Other.php#L41
- wordpress.org /plugins/ninja-forms/
- plugins.trac.wordpress.org /changeset/3749135/ninja-forms/trunk/assets/js/min/front-end.js
Sources
- CVE List CVE-2026-100151
- NVD CVE-2026-100151
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.