CVE-2025-13748

Unknown Unknown - Not Provided

BaseFortify

Publication date: 2025-12-06

Last updated on: 2025-12-08

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, 6.1.7 via the 'submission_id' parameter due to missing validation on a user controlled key within the confirmScaPayment() function. This makes it possible for unauthenticated attackers to mark arbitrary submissions as failed via crafted requests to the endpoint granted they can guess or enumerate a valid submission identifier.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2025-12-06

Last Modified

2025-12-08

Generated

2026-07-06

AI Q&A

2025-12-10

EPSS Evaluated

2026-07-05

NVD

CVE-2025-13748

Affected Vendors & Products

Vendor	Product	Version / Range
fluent_forms	fluent_forms	*

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Detection Guidance

Detection can focus on monitoring requests to the endpoint handling the 'submission_id' parameter for unusual or unauthorized attempts to mark submissions as failed. Since the vulnerability involves unauthenticated crafted requests with guessed or enumerated submission IDs, inspecting web server logs for repeated or suspicious POST requests to the payment confirmation endpoints related to Fluent Forms may help. Additionally, enabling WP_DEBUG and monitoring logs for warnings related to nonce validation failures can assist in detection. Specific commands depend on your environment, but for example, using grep on web server logs to find requests containing 'submission_id' or '_ff_stripe_nonce' parameters can be useful. Example: `grep 'submission_id' /var/log/apache2/access.log` or `grep '_ff_stripe_nonce' /var/log/apache2/access.log`. [2]

Mitigation Strategies

The immediate mitigation step is to update the Fluent Forms plugin to version 6.1.8 or later, which includes security enhancements such as nonce-based verification for SCA confirmation requests, strict nonce validation modes, and improved validation of payment intents to prevent unauthorized marking of submissions as failed. If updating immediately is not possible, enabling WP_DEBUG to monitor suspicious activity and restricting access to the payment confirmation endpoints may help reduce risk temporarily. [2]

Executive Summary

This vulnerability is an Insecure Direct Object Reference (IDOR) in the Fluent Forms WordPress plugin up to version 6.1.7. It occurs because the 'submission_id' parameter in the confirmScaPayment() function lacks proper validation. This allows unauthenticated attackers to manipulate the parameter to mark arbitrary form submissions as failed if they can guess or enumerate valid submission IDs.

Impact Analysis

The vulnerability allows unauthenticated attackers to mark arbitrary form submissions as failed, potentially disrupting form processing or workflows that depend on submission status. This could lead to denial of service for legitimate submissions or manipulation of submission outcomes.

Hi! I’m here to help you understand CVE-2025-13748. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70