Answer in brief
CVE-2026-109997 records a High severity (CVSS 7.2) vulnerability in Ninja Forms <= 3.15.5 - Unauthenticated Stored Cross-Site Scripting via 'extra' Parameter via Metadata Key Normalization. The current sources do not mark it as known exploited. The current feed maps kstover/Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps kstover/Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| kstover/Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Buildergeneric | >=0 <=3.15.5 | Not reported |
Published upstream
Oct 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 31, 2026
The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'formData.extra' 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 will execute whenever a user accesses an injected page. The nf_ajax_submit endpoint issues a valid nonce to any requester on failure, effectively neutralizing the nonce check and making exploitation trivially achievable in a single unauthenticated request.
Quoted source text, attributed separately from HOL analysis.