CVE-2025-66026: REDAXO CMS is vulnerable to Reflected XSS in Mediapool Info Banner via args[types]

CVE-2025-66026 · Severity: medium · CVSS 6.1 · Published 2025-11-26

REDAXO is a PHP-based CMS. Prior to version 5.20.1, a reflected Cross-Site Scripting (XSS) vulnerability exists in the Mediapool view where the request parameter args[types] is rendered into an info banner without HTML-escaping. This allows arbitrary JavaScript execution in the backend context when an authenticated user visits a crafted link while logged in. This issue has been patched in version 5.20.1.

Technologies: redaxo/source (Packagist), REDAXO. Vendors: Packagist, REDAXO.

Quick answers

Is CVE-2025-66026 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-66026 being exploited in the wild.
How severe is CVE-2025-66026?
Medium severity, with a CVSS score of 6.1, published 26 November 2025.
Which products and versions are affected?
redaxo/source (Packagist) ECOSYSTEM:introduced=0,fixed=5.20.1.
Is there a fix for CVE-2025-66026?
Yes. redaxo/source (Packagist): upgrade to 5.20.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-66026?
Check whether you run redaxo/source (Packagist) or REDAXO 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.

How to fix

  • redaxo/source (Packagist): upgrade to 5.20.1 or later
    composer require redaxo/source:^5.20.1

Affected products

  • redaxo/source (Packagist) ECOSYSTEM:introduced=0,fixed=5.20.1
  • REDAXO

Identifiers

  • CVE-2025-66026
  • GHSA-x6vr-q3vf-vqgq

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