Ninja Forms <= 3.15.5 - Reflected DOM-Based Cross-Site Scripting via 'querystring:<key>' URL Parameter

Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder · Cross-site scripting · CWE-79

AffectedNinja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

FixNo fix listed yet.

PublishedOct 31, 09:29 · Wordfence

ScoredOct 31 · 6.1 · 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.

Someone has to open, click or run something first. CVSS: user interaction required.

Description

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.

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

References

Other CVEs in Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder

All 5 →

6.5Ninja Forms <= 3.15.5 - Unauthenticated Arbitrary Shortcode Execution via 'formData' Field Value via Success Message Merge Tag · CVE-2026-100155Oct 31 7.2Ninja Forms <= 3.15.5 - Unauthenticated Stored Cross-Site Scripting via 'extra' Parameter via Metadata Key Normalization · CVE-2026-109997Oct 31 5.4Ninja Forms <= 3.15.5 - Authenticated (Subscriber+) Arbitrary Shortcode Execution via '{wp:user_display_name}' Merge Tag via display_name · CVE-2026-101326Oct 31