Fluent Forms <= 6.2.8 - Unauthenticated Sensitive Information Exposure via Insecure Direct Object Reference and Weak Transaction Hash in 'transaction' Parameter
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder | <= 6.2.8 | 6.2.9 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-639- Platform
- WordPress
- Package
Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder- Disclosed
- 30.07.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 565980d7-8dc9-42a4-90c5-2f75af52fb8e - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 45
- First → latest
- 06.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 10
- Medium 34
Disclosures per year
- 2021: 1
- 2022: 1
- 2023: 3
- 2024: 15
- 2025: 4
- 2026: 21
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Fluent Forms <= 6.2.8 - Unauthenticated Sensitive Information Exposure via Insecure Direct Object Reference and Weak Transaction Hash in 'transaction' Parameter this entry
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