CVE-2026-17571

Fluent Forms <= 6.2.8 - Reflected Cross-Site Scripting via 'param'

The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 'param' in all versions up to, and including, 6.2.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

We have discovered 90,742 live websites that are affected by CVE-2026-17571.

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



Details

  • Published - Aug 1, 2026
  • Updated - Aug 3, 2026

Credits

  • Osvaldo Noe Gonzalez Del Rio (Os) (finder)

Website Distribution by Country

Number of websites using CVE-2026-17571
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-2026-17571
.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-2026-17571

Top websites that are affected by CVE-2026-17571. 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-2026-17571 is Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Fluentform
A total of 90,742 websites have been identified as vulnerable to CVE-2026-17571, based on global website indexing conducted by WebTechSurvey.
The Fluentform is affected by the CVE-2026-17571 vulnerability.
Fluentform versions up to and including 6.2.8 are vulnerable to CVE-2026-17571.