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WordPress plugin

Formidable Form Builder <= 5.0.06 — Admin+ Stored Cross-Site Scripting

CVE-2021-24608Published · Updated

Action summary

Affected: <5.0.07Update to 5.0.07 or newer

All remediation steps
Watch plugin
Severity
Medium4.8
CVSS
4.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:H Privileges required
High
UI:R User interaction
Required
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-79 Cross-Site Scripting
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder formidable

  1. Affected< 5.0.07
  2. Patched in5.0.07

Update to 5.0.07 or newer.

You are affected if you run < 5.0.07. Version 5.0.07 and later are not affected by this issue.

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

What to do

  1. Update to version 5.0.07, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Asif Nawaz Minhas.

The Formidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress plugin before 5.0.07 does not sanitise and escape its Form's Labels, allowing high privileged users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed

Exploits & references

Proof-of-concept & detection

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

Advisories & patches

More in Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder

All 29
More vulnerabilities in Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder
SeverityVulnerabilityCVEPublished
High8.8Authenticated (Subscriber+) Arbitrary Plugin Installation via 'file_url' Parameter
≤6.35Update to 7.0
CVE-2026-89435
High7.5Unauthenticated Denial of Service
<7.0Update to 7.0
CVE-2026-85642
Medium5.3Unauthenticated Content Injection
≤6.34Update to 6.35
CVE-2026-85641
Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤6.34Update to 6.35
CVE-2026-19857
High7.2Unauthenticated Stored Cross-Site Scripting via 'frm_user_id' Parameter
≤6.33.1Update to 6.34
CVE-2026-18331

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 4.8

  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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