CVE-2026-5399
Deferred Deferred - Pending Action

Stored XSS in Redux Framework WordPress Plugin

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: Wordfence

Description
The Redux Framework plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Slider field in User Profile settings in versions up to and including 4.5.13.1. This is due to insufficient input sanitization in the user_meta_save() function (which only sanitizes array values, not scalar values) and improper output escaping in the Redux_Slider::render() method, which outputs slider values into unquoted HTML attributes. The vulnerability also exploits the fact that the clean_default() method only casts values to numeric types when they are empty or out of bounds, allowing malicious strings like '1 tabindex=0 autofocus onfocus=alert(1) x=' to pass validation through PHP's loose type comparison. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts into their user profile that will execute whenever an Administrator navigates to view the attacker's profile page.

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Meta Information

Published
2026-09-10
Last Modified
2026-09-10
Generated
2026-09-30
AI Q&A
2026-09-10
EPSS Evaluated
2026-09-29
NVD
CVE-2026-5399
EUVD
EUVD-2026-75365

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
reduxframework redux_framework to 4.5.13.1 (inc)
reduxframework redux_framework to 4.5.14 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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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.

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Executive Summary

CVE-2026-5399 is a Stored Cross-Site Scripting (XSS) vulnerability in the Redux Framework plugin for WordPress affecting versions up to 4.5.13.1. It occurs due to insufficient input sanitization in the user_meta_save() function and improper output escaping in the Redux_Slider::render() method. Attackers with Subscriber-level access or higher can inject malicious scripts into their user profiles that execute when an Administrator views their profile.

Detection Guidance

Check if the Redux Framework plugin version is 4.5.13.1 or lower. Inspect user profile pages for injected scripts in slider fields. Review server logs for unusual activity from authenticated users with Subscriber-level access or higher.

Impact Analysis

If you are a WordPress site administrator, this vulnerability allows attackers to inject malicious scripts into your site. These scripts can steal sensitive data, hijack user sessions, or perform actions on behalf of users. If you are a regular user, your browser may execute harmful scripts when visiting a compromised profile.

Compliance Impact

This vulnerability could lead to data breaches, exposing personal or sensitive information. For GDPR, it may result in unauthorized access to user data, violating principles of data protection. For HIPAA, it could compromise protected health information, leading to compliance violations and legal penalties.

Mitigation Strategies

Update the Redux Framework plugin to version 4.5.14 or later. Remove or disable the plugin if an update is not immediately possible. Restrict Subscriber-level access to trusted users only.

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