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CVE-2026-18146— Fluent Forms <= 6.2.11 - Unauthenticated Stored Cross-Site Scripting via Notification Smartcode Values

Quick assessment

Affected
wpmanageninja 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 Fluent Forms是WordPress基金会开源的一款表单插件。 WordPress Fluent Forms 6.2.11及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致未认证攻击者注入任意Web脚本，当管理员在WordPress管理后台查看表单的提交日志时在浏览器中执行。

CVSS 7.2 · High EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpmanageninja Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder ≤ 6.2.11 affected
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I. Basic Information for CVE-2026-18146

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Fluent Forms <= 6.2.11 - Unauthenticated Stored Cross-Site Scripting via Notification Smartcode Values
Source: CVE Program / CVE List V5
Vulnerability Description
The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Notification Smartcode Values in all versions up to, and including, 6.2.11 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in the browser of an administrator (or any user with the Fluent Forms entry-viewing capability) when they view the form's entry Submission Logs in the WordPress admin dashboard. Exploitation requires that a site administrator or Fluent Forms manager has configured an email notification whose subject or static (direct) Send To value references an attacker-influenced Smartcode such as an input_password field value, a cookie value, or submission.response.
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
Vulnerability Title
WordPress Fluent Forms 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Fluent Forms是WordPress基金会开源的一款表单插件。 WordPress Fluent Forms 6.2.11及之前版本存在跨站脚本漏洞，该漏洞源于输入清理和输出转义不足，可能导致未认证攻击者注入任意Web脚本，当管理员在WordPress管理后台查看表单的提交日志时在浏览器中执行。
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
wpmanageninja Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder 0 ~ 6.2.11 -

II. Public POCs for CVE-2026-18146

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III. Intelligence Information for CVE-2026-18146

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Patches & Fixes for CVE-2026-18146 (7)

Security Blog Posts for CVE-2026-18146 (1)

Same Patch Batch · wpmanageninja · 2026-08-13 · 4 CVEs total

CVE-2026-73533 9.8 CRITICAL Ninja Tables Pro 5.2.11 Embedded Malicious Code via Tampered Plugin Build
CVE-2026-73532 9.8 CRITICAL Fluent Forms Pro 6.2.7 Embedded Malicious Code via Tampered Plugin Build
CVE-2026-66467 6.5 MEDIUM WordPress FluentCommunity plugin <= 2.7.5 - Cross Site Scripting (XSS) vulnerability

IV. Related Vulnerabilities

Same product: Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
Same vendor: wpmanageninja
Same weakness: CWE-79

V. Comments for CVE-2026-18146

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