Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder <= 6.1.21 — Insecure Direct Object Reference in Stripe SCA Confirmation to Unauthenticated Payment Status Modification
CVE-2026-4160Published · Updated Action summary
Affected: 6.1.21 – 6.1.21Update to 6.2.0 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- 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
- Affected6.1.21 – 6.1.21
- Patched in6.2.0
Update to 6.2.0 or newer.
You are affected if you run 6.1.21 – 6.1.21. Version 6.2.0 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under 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.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 6.2.0, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- 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 Prickly Cactus.
The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference via the 'submission_id' parameter in versions up to, and including, 6.1.21. This is due to missing authorization and ownership validation on a user controlled key in the Stripe SCA confirmation AJAX endpoint. This makes it possible for unauthenticated attackers to modify payment status of targeted pending submissions (for example, setting the status to "failed").
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
All 47| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Missing Authorization ≤6.2.16Update to 6.2.17 | CVE-2026-120858 | |
| Medium5.3 | Missing Authorization ≤6.2.15Update to 6.2.16 | CVE-2026-111831 | |
| Medium5.4 | Missing Authorization to Authenticated (Custom+) Sensitive Data Exposure and Modification ≤6.2.5Update to 6.2.6 | CVE-2026-15178 | |
| Medium4.7 | Reflected Cross-Site Scripting via '{get.*}' Editor SmartCode Parameter ≤6.2.14Update to 6.2.15 | CVE-2026-101324 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤6.2.14Update to 6.2.15 | CVE-2026-103343 |
- Medium5.3Missing Authorization
≤6.2.16Update to 6.2.17
- Medium5.3Missing Authorization
≤6.2.15Update to 6.2.16
- Medium5.4Missing Authorization to Authenticated (Custom+) Sensitive Data Exposure and Modification
≤6.2.5Update to 6.2.6
- Medium4.7Reflected Cross-Site Scripting via '{get.*}' Editor SmartCode Parameter
≤6.2.14Update to 6.2.15
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤6.2.14Update to 6.2.15
Timeline
CVE published
Severity medium, CVSS 5.3
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.