Fluent Forms Pro Add On Pack <= 6.1.17 — Missing Authorization to Unauthenticated Payment Status modification
CVE-2026-2428Published · Updated Action summary
Affected: ≤6.1.17Update to 6.1.18 or newer
All remediation steps- Severity
- High7.5
- CVSS
- 7.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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:HIntegrity- High
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 Pro Add On Pack fluentformpro
- Affected≤ 6.1.17
- Patched in6.1.18
Update to 6.1.18 or newer.
You are affected if you run ≤ 6.1.17. Version 6.1.18 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 Pro Add On Pack.
- 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 6.1.18, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Fluent Forms Pro Add On Pack to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Prickly Cactus.
The Fluent Forms Pro Add On Pack plugin for WordPress is vulnerable to Insufficient Verification of Data Authenticity in all versions up to, and including, 6.1.17. This is due to the PayPal IPN (Instant Payment Notification) verification being disabled by default (`disable_ipn_verification` defaults to `'yes'` in `PayPalSettings.php`). This makes it possible for unauthenticated attackers to send forged PayPal IPN notifications to the publicly accessible IPN endpoint, marking unpaid form submissions as "paid" and triggering post-payment automation (emails, access grants, digital product delivery).
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 Pro Add On Pack
All 11| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Missing Authorization ≤6.2.13Update to 6.2.14 | CVE-2026-94669 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤6.2.13Update to 6.2.14 | CVE-2026-94675 | |
| Medium6.3 | Authenticated (Subscriber+) Privilege Escalation ≤6.2.12Update to 6.2.13 | CVE-2026-81297 | |
| Medium5.3 | Missing Authorization ≤6.2.12Update to 6.2.13 | CVE-2026-81296 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting <6.2.12Update to 6.2.12 | CVE-2026-66633 |
- Medium5.3Missing Authorization
≤6.2.13Update to 6.2.14
- High7.2Unauthenticated Stored Cross-Site Scripting
≤6.2.13Update to 6.2.14
- Medium6.3Authenticated (Subscriber+) Privilege Escalation
≤6.2.12Update to 6.2.13
- Medium5.3Missing Authorization
≤6.2.12Update to 6.2.13
- High7.2Unauthenticated Stored Cross-Site Scripting
<6.2.12Update to 6.2.12
Timeline
CVE published
Severity high, CVSS 7.5
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.