CVE-2026-2428

Summary

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).

Affected Software

VendorProductVersion RangeStatus
techjewelFluent Forms Pro Add On Pack0 <= 6.1.17affected

Weaknesses

  • CWE-345: CWE-345 Insufficient Verification of Data Authenticity

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References