CVE-2026-17567mediumCWE-639

CVE-2026-17567: medium-severity vulnerability in wpmanageninja Fluent Forms – Customizable…

Fluent Forms <= 6.2.8 - Unauthenticated Sensitive Information Exposure via Insecure Direct Object Reference and Weak Transaction Hash in 'transaction' Parameter

Published

Follow this CVE+ Monitor Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 0.6%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
wpmanageninja · Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
Related CVEs — wpmanageninja Fluent Forms – Customizable…

In the same product, most dangerous first.

CVE-2026-16655HIGHFluent Forms <= 6.2.7 - Unauthenticated Stored Cross-Site Scripting via Name Field Nested `password` MemberEPSS 0.5%CVE-2026-18146HIGHFluent Forms <= 6.2.11 - Unauthenticated Stored Cross-Site Scripting via Notification Smartcode ValuesEPSS 0.5%CVE-2026-17571MEDIUMFluent Forms <= 6.2.8 - Reflected Cross-Site Scripting via 'param'EPSS 0.4%CVE-2026-5069MEDIUMFluent Forms <= 6.2.1 - Incorrect Authorization to Authenticated (Subscriber+) Arbitrary Subscription Cancellation via 'subscription_id'EPSS 0.3%CVE-2026-101324MEDIUMFluent Forms <= 6.2.14 - Reflected Cross-Site Scripting via '{get.*}' Editor SmartCode ParameterEPSS 0.2%CVE-2026-15178MEDIUMFluent Forms <= 6.2.5 - Missing Authorization to Authenticated (Custom+) Sensitive Data Exposure and ModificationEPSS 0.2%