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GHSA-x6vr-q3vf-vqgq

MediumCVSS 6.1 / 10
Published Nov 25, 2025·Last modified Nov 27, 2025
Affected Components(0)

No affected components available

Description

Summary

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.

Details

Control Flow:

  1. redaxo/src/addons/mediapool/pages/index.php reads args via rex_request('args', 'array') and passes them through as $argUrl to media.list.php.
  2. redaxo/src/addons/mediapool/pages/media.list.php injects $argUrl['args']['types'] into an HTML string without escaping:
if (!empty($argUrl['args']['types'])) {
    echo rex_view::info(rex_i18n::msg('pool_file_filter') . ' <code>' . $argUrl['args']['types'] . '</code>');
}

PoC

  1. Log into the REDAXO backend.
  2. While authenticated, open a crafted URL like: <host>/index.php?page=mediapool/media&args[types]="><img+src%3Dx+onerror%3Dalert%28document.domain%29>
  3. The info banner displays the unescaped value and activates the injected onerror handler, which opens an alert pop-up.

Impact

Arbitrary JavaScript execution in the backend, enabling theft of session cookies, CSRF tokens, or other sensitive data, and allowing an attacker to perform any administrative actions on behalf of the affected user.

Risk Scores
Base Score
6.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
5.6

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.26%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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