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VulnerabilityPublished

CVE-2026-100151: Ninja Forms (WordPress plugin) · Cross-site Scripting

Affects Ninja Forms (WordPress plugin)Source CVE Database V5

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Not known to be exploited · CVSS 6.1 Medium.

Data as of 31 Oct 2026, 09:51 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Wordfence)CVSS 3.16.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 31 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
kstoverNinja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form BuilderAffected
  • <=3.15.5
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

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