What’s Vulnerable › Vulnerabilities

CVE-2025-13748: Fluent Forms <= 6.1.7 - Unauthenticated Insecure Direct Object Reference to Payment Status Tampering via submission_id

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-06 · updated 2026-10-15
• Weakness: CWE-639

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.

Affected products

• techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder: through 6.1.7

References

• https://plugins.trac.wordpress.org/changeset/3406804/fluentform/tags/6.1.8/app/Modules/Payments/PaymentMethods/Stripe/StripeInlineProcessor.php
• https://www.wordfence.com/threat-intel/vulnerabilities/id/c2aee799-4e4c-4a41-8b76-e2ad576fe2e2?source=cve

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