wpmanageninja Fluent Forms Plugin up to 6.2.8 on WordPress transaction authorization

Summaryinfo

A vulnerability categorized as problematic has been discovered in wpmanageninja Fluent Forms Plugin up to 6.2.8. This impacts an unknown function. Such manipulation of the argument transaction leads to authorization. This vulnerability is traded as CVE-2026-17567. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in wpmanageninja Fluent Forms Plugin up to 6.2.8. It has been rated as problematic. Affected by this issue is an unknown functionality. The manipulation of the argument transaction with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-17567 since 07/27/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/31/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-51517). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• WordPress Plugin

Vendor

• wpmanageninja

Name

• Fluent Forms Plugin

Version

• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8

CPE 2.3info

• 🔒
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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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