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WordPress plugin

Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.18 — Missing Authorization to Authenticated (Subscriber+) Mailchimp Integration Modification

CVE-2024-5053Published · Updated

Action summary

Affected: ≤5.1.18Update to 5.1.19 or newer

All remediation steps
Watch plugin
Severity
Medium4.2
CVSS
4.2
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:H Attack complexity
High
PR:L Privileges required
Low
UI:N User interaction
None
S:U Scope
Unchanged
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-285 Improper Authorization
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder fluentform

  1. Affected≤ 5.1.18
  2. Patched in5.1.19

Update to 5.1.19 or newer.

You are affected if you run ≤ 5.1.18. Version 5.1.19 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 5.1.19, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Tobias Weißhaar (kun_19).

The Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder plugin for WordPress is vulnerable to unauthorized Malichimp API key update due to an insufficient capability check on the verifyRequest function in all versions up to, and including, 5.1.18. This makes it possible for Form Managers with a Subscriber-level access and above to modify the Mailchimp API key used for integration. At the same time, missing Mailchimp API key validation allows the redirect of the integration requests to the attacker-controlled server.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder

All 47
More vulnerabilities in Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
SeverityVulnerabilityCVEPublished
Medium5.3Missing Authorization
≤6.2.16Update to 6.2.17
CVE-2026-120858
Medium5.3Missing Authorization
≤6.2.15Update to 6.2.16
CVE-2026-111831
Medium5.4Missing Authorization to Authenticated (Custom+) Sensitive Data Exposure and Modification
≤6.2.5Update to 6.2.6
CVE-2026-15178
Medium4.7Reflected Cross-Site Scripting via '{get.*}' Editor SmartCode Parameter
≤6.2.14Update to 6.2.15
CVE-2026-101324
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤6.2.14Update to 6.2.15
CVE-2026-103343

Timeline

  1. CVE published

    Severity medium, CVSS 4.2

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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