7.2
HighCVSS 3.1 · from Wordfence
CVE-2026-109997
Ninja Forms <= 3.15.5 - Unauthenticated Stored Cross-Site Scripting via 'extra' Parameter via Metadata Key Normalization
Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder · Cross-site scripting · CWE-79AffectedNinja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder
FixNo fix listed yet.
PublishedOct 31, 05:33 · Wordfence
ScoredOct 31 · 7.2 · Wordfence
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:07 UTC
What we know
No known exploitation. CISA KEV, checked 22:07 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
Description
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.
From Wordfence
Affected and fixed versions
ProductAffectedFixed inNinja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builderup to 3.15.5–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known