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CVE-2026-94504— Ninja Forms – The Contact Form Builder That Grows With You <= 3.15.3 - Stored Cross-Site Scripting

Quick assessment

Affected
kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ninja Forms 3.15.3 版本将匿名的非富文本（non-RTE）文本域（textarea）值进行存储，并在旧版提交编辑器（legacy submission editor）中渲染时未对其执行安全的 HTML 编码。攻击者可以利用这一漏洞，通过存储型脚本（stored script）突破文本域的限制。当管理员访问攻击者已知的直接提交 URL 时，该脚本将在 WordPress 管理后台域（origin）中执行，从而导致存储型跨站脚本（Stored XSS）漏洞。

CVSS 7.2 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder ≤ 3.15.3 affected
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I. Basic Information for CVE-2026-94504

Vulnerability Information
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Vulnerability Title
Ninja Forms – The Contact Form Builder That Grows With You <= 3.15.3 - Stored Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
Ninja Forms 3.15.3 stores an anonymous non-RTE textarea value and renders it without safe HTML encoding in the legacy submission editor. An attacker can break out of the textarea with stored script. When an Administrator opens the attacker-known direct submission URL, the script runs in the WordPress admin origin.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder 0 ~ 3.15.3 -

II. Public POCs for CVE-2026-94504

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III. Intelligence Information for CVE-2026-94504

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Other References for CVE-2026-94504 (4)

Other References for CVE-2026-94504 (1)

IV. Related Vulnerabilities

Same product: Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder
Same vendor: kstover
Same weakness: CWE-79

V. Comments for CVE-2026-94504

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