CVE-2026-66633
Received Received - Intake

Unauthenticated XSS in Fluent Forms Pro Add On

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Patchstack

Description
Unauthenticated Cross Site Scripting (XSS) in Fluent Forms Pro Add On Pack < 6.2.12 versions.

CVSS Scores

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-66633
EUVD
EUVD-2026-60918

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
fluent_forms fluent_forms_pro_add_on_pack to 6.2.12 (exc)

Helpful Resources

Exploitability

CWE
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KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability in the Fluent Forms Pro Add On Pack plugin for WordPress versions below 6.2.12. It allows attackers to inject malicious scripts into web pages viewed by users. The vulnerability has a CVSS score of 7.1, indicating moderate severity.

Detection Guidance

To detect this XSS vulnerability in Fluent Forms Pro Add On Pack versions below 6.2.12, check the installed plugin version in WordPress admin panel under Plugins. Look for version numbers like 6.2.11 or lower. You can also use command-line tools like grep to search for vulnerable files in the plugin directory: grep -r 'fluent_forms_pro_add_on_pack' /path/to/wordpress/wp-content/plugins/

Impact Analysis

Attackers could exploit this to inject harmful scripts that may redirect visitors, display unwanted ads, or execute other malicious actions when users access the site. Successful exploitation requires a user to interact with a malicious link or form, but the impact could affect many visitors.

Mitigation Strategies

Immediately update the Fluent Forms Pro Add On Pack plugin to version 6.2.12 or later via the WordPress admin panel. If updating is not possible, apply Patchstack's mitigation rule to block attacks until the update is completed. Remove or disable the plugin if unused.

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