CVE-2026-18146

Fluent Forms <= 6.2.11 - Unauthenticated Stored Cross-Site Scripting via Notification Smartcode Values

The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Notification Smartcode Values in all versions up to, and including, 6.2.11 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in the browser of an administrator (or any user with the Fluent Forms entry-viewing capability) when they view the form's entry Submission Logs in the WordPress admin dashboard. Exploitation requires that a site administrator or Fluent Forms manager has configured an email notification whose subject or static (direct) Send To value references an attacker-influenced Smartcode such as an input_password field value, a cookie value, or submission.response.

We have discovered 97,501 live websites that are affected by CVE-2026-18146.

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Affected Software

Product  Fluentform
Category Wordpress Plugins
Vulnerable Domains97,501 live websites (100% of Fluentform install base)
Vulnerable Versions
  • from 0 through 6.2.11
Vulnerable Versions Count110 versions ( 100% of all versions)


Common Weakness Enumeration

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')



Details

  • Published - Aug 13, 2026
  • Updated - Aug 13, 2026

Credits

  • Adrien Brunner (finder)

Website Distribution by Country

Number of websites using CVE-2026-18146
United States30,050 websites


Germany10,207 websites
GB5,860 websites
France4,732 websites
Netherlands3,647 websites
India2,566 websites
Australia2,545 websites
Italy2,507 websites
Canada2,376 websites
Poland2,172 websites

Website Distribution by TLD

Number of websites using CVE-2026-18146
.com41,918 websites
.de6,161 websites
.org4,457 websites
.co.uk3,473 websites
.nl3,312 websites
.com.au2,384 websites
.fr2,168 websites
.it1,856 websites
.net1,840 websites
.com.br1,776 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-18146

Top websites that are affected by CVE-2026-18146. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
***.***.ca Canada*,***
**********.com United States*,***
********.com United States*,***
***************.com United States*,***
*****************.com United States*,***
********************.com Thailand**,***
********.com Germany**,***
*********************.fr France**,***
************.vn Vietnam**,***
**********************.org United States**,***
See full domain list

FAQ

CVE-2026-18146 is Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Fluentform
A total of 97,501 websites have been identified as vulnerable to CVE-2026-18146, based on global website indexing conducted by WebTechSurvey.
The Fluentform is affected by the CVE-2026-18146 vulnerability.
Fluentform versions up to and including 6.2.11 are vulnerable to CVE-2026-18146.

References