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CVE-2026-17567

MEDIUM 5.3 CVSS 3.1
Published
July 31, 2026
Last modified
August 12, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-639
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Description

The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 6.2.8 via the 'transaction' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to brute-force valid transaction hashes and view sensitive payment receipt data including customer name, email address, billing address, order items, payment method, and payment status belonging to other users. Because submission ID, form ID, and transaction creation time are either observable or guessable by an attacker, the effective brute-force space is bounded to approximately 900 candidates per second per (submission, form) pair, making exploitation practical without any prior authentication or account.

Affected WordPress components

  • Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder Plugin · fluentform
    Confirmed match Active
    Up to and including 6.2.8
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wpmanageninja Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder — Up to and including 6.2.8

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/PaymentHandler.php#L218
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/PaymentMethods/BaseProcessor.php#L959
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.4/app/Modules/Payments/TransactionShortcodes.php#L107
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/PaymentHandler.php#L218
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/PaymentMethods/BaseProcessor.php#L959
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Modules/Payments/TransactionShortcodes.php#L107
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3625751/fluentform/trunk/app/Modules/Payments/PaymentMethods/BaseProcessor.php
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?old_path=%2Ffluentform/tags/6.2.8&new_path=%2Ffluentform/tags/6.2.9
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/565980d7-8dc9-42a4-90c5-2f75af52fb8e?source=cve
  • nvd.nist.gov Official NVD record