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CVE-2026-90438— Ninja Forms <= 3.15.4 - Unauthenticated Stored Cross-Site Scripting via Paragraph Text (RTE) Field Submission

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.

WordPress 插件 “Ninja Forms – The Contact Form Builder That Grows With You” 存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞。该漏洞出现在 3.15.4 及更早版本中，原因在于对段落文本（RTE，即富文本编辑器）字段提交内容的输入净化和输出转义处理不足。攻击者无需认证即可在页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将会执行。需要注意的是，该漏洞仅在目标“段落文本”字段启用了富文本编

CVSS 7.2 · High EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
kstover Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder ≤ 3.15.4 affected
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I. Basic Information for CVE-2026-90438

Vulnerability Information
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Vulnerability Title
Ninja Forms <= 3.15.4 - Unauthenticated Stored Cross-Site Scripting via Paragraph Text (RTE) Field Submission
Source: CVE Program / CVE List V5
Vulnerability Description
The Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Paragraph Text (RTE) Field Submission in all versions up to, and including, 3.15.4 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. This is only exploitable when the targeted Paragraph Text field has the Rich Text Editor (RTE) option enabled.
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 ~ 3.15.4 -

II. Public POCs for CVE-2026-90438

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III. Intelligence Information for CVE-2026-90438

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Patches & Fixes for CVE-2026-90438 (4)

Vendor Advisories for CVE-2026-90438 (1)

Other References for CVE-2026-90438 (2)

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-2026-90438

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