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CVE-2026-5396— Fluent Forms <= 6.1.21 - Authenticated (Subscriber+) Authorization Bypass via 'form_id' Parameter

Quick assessment

Affected
techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational 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和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Fluent Forms 6.1.21及之前版本存在安全漏洞，该漏洞源于SubmissionPolicy类基于用户提供的form_id参数授权提交级操作，可能导致经过身份验证的攻击者通过伪造form_id参数访问其他

CVSS 8.2 · High EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder ≤ 6.1.21 affected
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I. Basic Information for CVE-2026-5396

Vulnerability Information
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Vulnerability Title
Fluent Forms <= 6.1.21 - Authenticated (Subscriber+) Authorization Bypass via 'form_id' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Fluent Forms plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in all versions up to, and including, 6.1.21. This is due to the SubmissionPolicy class authorizing submission-level actions (read, modify, delete, add notes) based on a user-supplied `form_id` query parameter. This makes it possible for authenticated attackers, with Fluent Forms Manager access restricted to specific forms, to read, modify status, add notes to, and permanently delete form submissions belonging to any other form by spoofing the form_id parameter to a form they are authorized for.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Fluent Forms 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Fluent Forms 6.1.21及之前版本存在安全漏洞，该漏洞源于SubmissionPolicy类基于用户提供的form_id参数授权提交级操作，可能导致经过身份验证的攻击者通过伪造form_id参数访问其他
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder 0 ~ 6.1.21 -

II. Public POCs for CVE-2026-5396

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III. Intelligence Information for CVE-2026-5396

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Vendor Advisories for CVE-2026-5396 (1)

IV. Related Vulnerabilities

Same product: Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
Same vendor: techjewel
Same weakness: CWE-639

V. Comments for CVE-2026-5396

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