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TI-2026-02060 Aliases CVE-2026-2428GHSA-23j5-87fx-hgc9

Fluent Forms Pro Add On Pack <= 6.1.17 - Missing Authorization to Unauthenticated Payment Status modification

Priority LOW 38CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-345.

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00158 4th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
techjewelFluent Forms Pro Add On Packup to 6.1.17—No fix listedCNA
  • Fluent Forms Pro Add On Pack Vendortechjewel Affected up to 6.1.17 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-2428
  2. 2026-10-03 Alias added: GHSA-23j5-87fx-hgc9

References

Other 2

  • TI-2024-08826 Deserialization of untrusted data in techjewel FluentSMTP – WP SMTP Plugin with Amazon… CVSS 3.1CRITICAL 9.8
  • TI-2026-13364 Deserialization of untrusted data in techjewel Fluent Forms Pro Add On Pack CVSS 3.1HIGH 8.8
  • TI-2026-04723 Fluent Forms <= 6.1.21 - Authenticated (Subscriber+) Authorization Bypass via 'form_id' Parameter CVSS 3.1HIGH 8.2
  • TI-2026-04722 Fluent Forms <= 6.2.0 - Authenticated (Subscriber+) Authorization Bypass via 'table' Parameter CVSS 3.1HIGH 8.2
  • TI-2026-02001 Fluent Forms Pro <= 6.1.17 - Unauthenticated Stored Cross-Site Scripting via Draft Form Submission CVSS 3.1HIGH 7.2
  • TI-2026-02493 Fluent Forms Pro Add On Pack <= 6.1.17 - Missing Authorization to Unauthenticated Arbitrary Attachment Deletion CVSS 3.1MEDIUM 6.5
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences