The WP Fluent Forms plugin < 3.6.67 for WordPress is vulnerable to Cross-Site Request Forgery leading to stored Cross-Site Scripting and limited Privilege Escalation due to a missing nonce check in the access control function for administrative AJAX actions
CVE-2021-34620 is a high severity with CVSS 8.8 Stored Cross-Site Scripting issue affecting the Plugin Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder. It affects Versions before 3.6.67 and is fixed in 3.6.67.
Use the related hub and response guides to connect this CVE-2021-34620 report with patch validation, scanner checks, and site hardening work.
Open the grouped hub for related CVEs, affected ranges, severity mix, and patch coverage.
Check access, XML-RPC exposure, backup readiness, and monitoring after patching.
Use containment, evidence capture, remediation, and validation steps when exploit risk is high.
CVE-2021-34620 is tracked for the Plugin Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder as high severity with CVSS 8.8. The affected range is Versions before 3.6.67. Update Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder to 3.6.67 or newer where that version is compatible with the site.
Search engines and operators need more than a title. This page exposes the identifier, affected range, patch evidence, and source coverage that make the vulnerability actionable.
This report has a CVE identifier, which makes it suitable for focused search and vulnerability triage workflows.
Affected version data gives operators a concrete comparison point against installed WordPress software.
A fixed version is present, so the page can answer update and remediation intent directly.
External references are available for source validation, advisory review, and incident notes.
Use these checks when converting this record into a patch ticket, incident note, or risk acceptance decision.
Inventory the installed Plugin package and compare its version with Versions before 3.6.67.
Confirm Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder is updated to 3.6.67 or newer.
Review references and CVSS vector details for exploitability, authentication requirements, and exposure path.
After patching, re-run vulnerability monitoring and keep the related plugin or theme hub under review for follow-up CVEs.
| Software Type | Plugin |
|---|---|
| Software Slug |
fluentform
View on wordpress.org
|
| CVE | CVE-2021-34620 |
| Patched Versions |
3.6.67
|
| Affected Versions |
Versions before 3.6.67
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.16 - Missing Authorization to Settings Update and Limited Privilege Escalation
Contact Form Plugin by FluentForm <= 4.3.12 - CSV Injection
Fluent Forms <= 6.2.0 - Authenticated (Subscriber+) Authorization Bypass via 'table' Parameter
Fluent Forms <= 6.1.21 - Authenticated (Subscriber+) Authorization Bypass via 'form_id' Parameter
Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.15 - PHP Object Injection via extractDynamicValues
Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.16 - Missing Authorization to Setting Manipulation
Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.2.6 - Unauthenticated Stored Cross-Site Scripting via Form Subject
FluentForm <= 4.3.25 - Authenticated (Administrator+) SQL Injection
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