Is CVE-2026-5400 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5400 being exploited in the wild.

How severe is CVE-2026-5400?

Medium severity, with a CVSS score of 6.4, published 19 September 2026.

Which products and versions are affected?

Redux Framework up to and including 4.5.13.

Is there a fix for CVE-2026-5400?

A patch was published on 2026-09-09: Fix merged in pull request #4112 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-5400 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-5400?

Check whether you run Redux Framework at an affected version. 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.

CVE-2026-5400: Redux Framework plugin stored XSS via Media field filter values

CVE-2026-5400 · Severity: medium · CVSS 6.4 · Published 2026-09-19

Redux Framework is a WordPress plugin that provides configuration and customization tools for WordPress sites. A stored cross-site scripting vulnerability in the Media field allows authenticated users with subscriber-level access to inject malicious scripts that execute when other users visit affected pages. Attackers could use this to deface pages, steal administrative credentials, or spread malware through the WordPress site.

Technologies: Redux Framework. Vendors: Redux Framework.

Quick answers

Is CVE-2026-5400 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5400 being exploited in the wild.
How severe is CVE-2026-5400?: Medium severity, with a CVSS score of 6.4, published 19 September 2026.
Which products and versions are affected?: Redux Framework up to and including 4.5.13.
Is there a fix for CVE-2026-5400?: A patch was published on 2026-09-09: Fix merged in pull request #4112 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-5400 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-5400?: Check whether you run Redux Framework at an affected version. 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

The vulnerability exists in the user_meta_save() function due to insufficient sanitization of nested array values in Media field filters, and in the render() function due to unsafe output of filter CSS values without proper escaping. An authenticated attacker with subscriber-level or higher permissions can inject arbitrary JavaScript through the Media field filter interface; the script persists and executes in the browsers of all users who access the affected page. A patch is available in pull request #4112 with improved escaping and sanitization.

Affected products

Redux Framework Redux Framework up to and including 4.5.13

Timeline

2026-09-19: disclosed
2026-09-09: patched: Fix merged in pull request #4112

References

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