CVE-2026-17567
Received Received - Intake

Fluent Forms Payment Data Exposure via IDOR

Publication date: 2026-07-31

Last updated on: 2026-07-31

Assigner: Wordfence

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.

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Meta Information

Published
2026-07-31
Last Modified
2026-07-31
Generated
2026-07-31
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-17567
EUVD
EUVD-2026-51517

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpforms fluent_forms to 6.2.8 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

This vulnerability is an Insecure Direct Object Reference (IDOR) in the Fluent Forms WordPress plugin. It allows unauthenticated attackers to brute-force transaction hashes via the 'transaction' parameter due to missing validation on a user-controlled key. This exposes sensitive payment receipt data like customer names, emails, billing addresses, order items, payment methods, and statuses belonging to other users.

Detection Guidance

This vulnerability involves an Insecure Direct Object Reference in the Fluent Forms WordPress plugin. To detect it, inspect WordPress sites using Fluent Forms versions up to 6.2.8 for exposed transaction parameters. Check server logs for repeated requests to transaction-related endpoints. No specific commands are provided in the context.

Impact Analysis

If you use the Fluent Forms plugin, attackers could access your customers' sensitive payment information without authentication. This includes personal details and transaction data, potentially leading to identity theft, fraud, or reputational damage for your business.

Compliance Impact

This vulnerability likely violates GDPR and HIPAA due to unauthorized access to personal and payment data. GDPR requires protecting personal data, while HIPAA mandates securing protected health information. Non-compliance could result in legal penalties, fines, and loss of customer trust.

Mitigation Strategies

Immediately update the Fluent Forms plugin to the latest version beyond 6.2.8. If an update is unavailable, disable the plugin temporarily. Review server logs for suspicious activity targeting transaction endpoints. Implement rate limiting on submission-related requests to reduce brute-force attempts.

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