# CVE-2026-66633: Fluent Forms Pro Add On Pack unauthenticated cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-66633-fluent-forms-pro-add-on-pack-unauthenticated-cross-site-scripting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-66633 · Severity: high · CVSS 7.1 · Published 2026-08-18

Fluent Forms Pro Add On Pack is a popular WordPress plugin for creating and managing web forms. An unauthenticated attacker can inject malicious scripts into the website through this vulnerability, allowing them to steal visitor data, hijack user accounts, or compromise the site's functionality without requiring any special access or credentials.

## Quick answers

**Is CVE-2026-66633 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66633 being exploited in the wild.

**How severe is CVE-2026-66633?** High severity, with a CVSS score of 7.1, published 18 August 2026.

**Which products and versions are affected?** WP ManageNinja LLC Fluent Forms Pro Add On Pack < 6.2.12.

**Is there a fix for CVE-2026-66633?** A patch was published on 2026-08-18: version 6.2.12 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-66633 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-66633?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is an unauthenticated cross-site scripting (XSS) vulnerability in Fluent Forms Pro Add On Pack versions prior to 6.2.12. The vulnerability allows attackers to inject malicious scripts that execute in the context of the affected website. While the vulnerability can be initiated by unauthenticated users, successful exploitation requires user interaction (such as a visitor clicking a malicious link or visiting a crafted page). The injected scripts can steal session cookies, perform actions on behalf of users, or redirect visitors to malicious sites. The patch is available in version 6.2.12 and later.

## Affected products

- WP ManageNinja LLC Fluent Forms Pro Add On Pack < 6.2.12

## Timeline

- 2026-08-18: disclosed
- 2026-08-18: patched: version 6.2.12

## References

- [https://patchstack.com/database/wordpress/plugin/fluentformpro/vulnerability/wordpress-fluent-forms-pro-add-on-pack-plugin-6-2-12-cross-site-scripting-xss-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/fluentformpro/vulnerability/wordpress-fluent-forms-pro-add-on-pack-plugin-6-2-12-cross-site-scripting-xss-vulnerability?_s_id=cve)