CVE-2026-5399 json
Redux Framework <= 4.5.13.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Slider Field Value
published 2026-09-10 1 mo ago modified 2026-09-10 59 d ago also EUVD-2026-75365
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/reduxframework/redux-framework#4112 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 1 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- davidanderson Redux Framework
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- github.com /reduxframework/redux-framework/pull/4112/changes
- wordfence.com /threat-intel/vulnerabilities/id/31c554cf-eee9-45a8-8fb6-198978620204?source=cve
- plugins.trac.wordpress.org /browser/redux-framework/trunk/redux-core/inc/fields/slider/class-redux-slider.php#L311
- plugins.trac.wordpress.org /browser/redux-framework/tags/4.5.10/redux-core/inc/fields/slider/class-redux-slider.php#L311
- plugins.trac.wordpress.org /browser/redux-framework/trunk/redux-core/inc/extensions/users/class-redux-extension-users.php#L1018
- plugins.trac.wordpress.org /browser/redux-framework/tags/4.5.10/redux-core/inc/extensions/users/class-redux-extension-users.php#L1018
Sources
- CVE List CVE-2026-5399
- NVD CVE-2026-5399
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.