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WordPress plugin

Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder < 7.0 — Unauthenticated Denial of Service

CVE-2026-85642Published · Updated

Action summary

Affected: <7.0Update to 7.0 or newer

All remediation steps
Watch plugin
Severity
High7.5
CVSS
7.5
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:N Confidentiality
None
I:N Integrity
None
A:H Availability
High
Weakness
CWE-400 Uncontrolled Resource Consumption
Required access
No account needed
Exploit prediction (EPSS)
0.4% chance in 30 days33th percentile
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< 7.0
  2. Patched in7.0

Update to 7.0 or newer.

You are affected if you run < 7.0. Version 7.0 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.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 7.0, 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 Naoki Kawahigashi.

The Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder plugin for WordPress is vulnerable to Denial of Service in all versions up to 7.0. This is due to insufficient validation of user supplied input. This makes it possible for unauthenticated attackers to make the affected site unavailable.

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
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
Medium5.3Unauthenticated Payment Bypass
≤6.32.0Update to 6.32.1
CVE-2026-11361

Timeline

  1. CVE published

    Severity high, CVSS 7.5

  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.
EPSS
Exploit Prediction Scoring System by FIRST.org.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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