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Vulnerabilities

Vulnerability · CVE-2026-2428

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.

Published Feb 27, 2026 · catalog updated Jun 17, 2026 · The Fluent Forms Pro

Check if you run it

No confirmed exploitation is on record for CVE-2026-2428. EPSS is 0.14%. Act only if a listed version of The Fluent Forms Pro is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The Fluent Forms Pro).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.14%
Remediation
Version ranges on file
Affected products
stated named in the record

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 ( defaults to in ). 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).

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated named in the record<= 6.1.17

How to fix CVE-2026-2428

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-2428. EPSS is 0.14%. Act only if a listed version of The Fluent Forms Pro is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 6.1.17. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-345: Insufficient Verification of Data Authenticity. EPSS 0.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 27, 2026 · NIST NVD

    Detected

    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 ( defaults to in ). This makes it possible for unauthenticated attackers to send forged PayPal IPN notifications to the publicly accessi

  2. Jun 17, 2026 · NIST NVD

    Updated

    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 ( defaults to in ). This makes it possible for unauthenticated attackers to send forged PayPal IPN notifications to the publicly accessi

Sources

  • CVE.orgVulnerability recordCVE-2026-2428

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-2428

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-2428

    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_ve

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.