CVE-2026-18146
Fluent Forms <= 6.2.11 - Unauthenticated Stored Cross-Site Scripting via Notification Smartcode Values
Description
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.
INFO
Published Date :
Aug. 13, 2026, 7:17 a.m.
Last Modified :
Aug. 13, 2026, 7:17 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-18146
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the Fluent Forms plugin to the latest version.
- Ensure email notification settings are reviewed.
- Sanitize and escape all user-supplied data.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-18146.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-18146 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-18146
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-18146 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-18146 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 13, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'wpmanageninja', 'product': 'Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'semver', 'lessThanOrEqual': '6.2.11'}], 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Reference https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Services/FormBuilder/Notifications/EmailNotification.php#L196 Added Reference https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Services/FormBuilder/ShortCodeParser.php#L142 Added Reference https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/app/Services/FormBuilder/ShortCodeParser.php#L145 Added Reference https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/assets/js/form_entries.js#L2 Added Reference https://plugins.trac.wordpress.org/browser/fluentform/tags/6.2.8/boot/globals.php#L98 Added Reference https://plugins.trac.wordpress.org/changeset/3640683/fluentform/trunk/app/Services/FormBuilder/ShortCodeParser.php Added Reference https://plugins.trac.wordpress.org/changeset?old_path=%2Ffluentform/tags/6.2.11&new_path=%2Ffluentform/tags/6.2.12 Added Reference https://plugins.trac.wordpress.org/changeset?reponame=&new=3640683%40fluentform%2Ftags%2F6.2.12&old=3632883%40fluentform%2Ftags%2F6.2.11 Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/643f92e2-b14e-4056-97fc-1c631027c54f?source=cve