CVE-2026-17567

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.

We have discovered 90,742 live websites that are affected by CVE-2026-17567.

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Affected Software

Product  Fluentform
Category Wordpress Plugins
Vulnerable Domains90,742 live websites (93% of Fluentform install base)
Vulnerable Versions
  • from 0 through 6.2.8
Vulnerable Versions Count107 versions ( 97% of all versions)


Common Weakness Enumeration

CWE-639 Authorization Bypass Through User-Controlled Key



Details

  • Published - Jul 31, 2026
  • Updated - Jul 31, 2026

Credits

  • ChinhNguyen (finder)

Website Distribution by Country

Number of websites using CVE-2026-17567
United States27,474 websites


Germany9,188 websites
GB5,512 websites
France4,401 websites
Netherlands3,348 websites
India2,503 websites
Australia2,407 websites
Italy2,378 websites
Canada2,211 websites
Cyprus2,064 websites

Website Distribution by TLD

Number of websites using CVE-2026-17567
.com38,904 websites
.de5,448 websites
.org3,937 websites
.co.uk3,307 websites
.nl3,056 websites
.com.au2,268 websites
.fr2,020 websites
.it1,765 websites
.net1,716 websites
.com.br1,716 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-17567

Top websites that are affected by CVE-2026-17567. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
***.***.ca Canada*,***
**********.com United States*,***
********.com United States*,***
*****************.com United States*,***
********.com Germany**,***
*********************.fr France**,***
************.vn Vietnam**,***
***************.com United States**,***
********.com United States**,***
*******.com United States**,***
See full domain list

FAQ

CVE-2026-17567 is Authorization Bypass Through User-Controlled Key in Fluentform
A total of 90,742 websites have been identified as vulnerable to CVE-2026-17567, based on global website indexing conducted by WebTechSurvey.
The Fluentform is affected by the CVE-2026-17567 vulnerability.
Fluentform versions up to and including 6.2.8 are vulnerable to CVE-2026-17567.

References