CVE-2026-57232

Contao: Server-Side Request Forgery (SSRF) via Unvalidated RSS Feed URL in Feed Reader Module

// Line 50-55
foreach (StringUtil::trimsplit('[\n\t ]', trim($model->rss_feed)) as $url) {
    try {
        $feed = $this->cache->get(
            'feed_reader_'.$model->id.'_'.md5($url),
            function (ItemInterface $item) use ($url, $model) {
                $readerResult = $this->feedIo->read($url, new Feed()); // <-- no validation

'eval' => array('mandatory'=>true, 'decodeEntities'=>true, 'style'=>'height:60px')

This is a CWE-918 (SSRF) vulnerability. A backend user with module-edit access can:

1. Enumerate internal network services -- probe any IP/port on the internal network by observing response times and error messages
2. Reach internal APIs -- access unauthenticated services inside the Docker/Kubernetes network (databases, caches, admin panels)
3. Steal cloud metadata credentials -- on AWS, fetch http://169.254.169.254/latest/meta-data/iam/security-credentials/ to obtain IAM role credentials (IMDSv1 has no authentication)
4. Pivot to internal infrastructure -- use the server as a proxy to interact with services not exposed to the public internet

Confirmed in live testing: the server successfully connected to the internal MySQL container (172.19.0.3:3306) and retrieved a full HTTP response from its own loopback interface (127.0.0.1:80).

Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.

CVE-2026-57232 has a CVSS score of 3.1 (Low). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (5.3.48, 5.7.9); upgrading removes the vulnerable code path.

Kodem intelligence

Already deployed Kodem?

1. Use NoPrivateNetworkHttpClient -- wrap the injected HTTP client with Symfony's built-in SSRF protection before passing it to feedIo:

   use Symfony\Component\HttpClient\NoPrivateNetworkHttpClient;
   
   $safeClient = new NoPrivateNetworkHttpClient($this->httpClient);
   

   This blocks all RFC-1918, loopback, and link-local addresses at the HTTP client level.

2. Validate URL scheme and host -- before calling feedIo->read(), parse the URL and reject anything that is not http:// or https:// with a public routable IP or hostname.

3. Configure the DCA field -- add 'rgxp' => 'url' and a custom validation callback to tl_module.rss_feed to reject non-public URLs at save time.

1. What is CVE-2026-57232? CVE-2026-57232 is a low-severity server-side request forgery (SSRF) vulnerability in contao/contao (composer), affecting versions >= 5.3.35, < 5.3.48. It is fixed in 5.3.48, 5.7.9. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.
2. How severe is CVE-2026-57232? CVE-2026-57232 has a CVSS score of 3.1 (Low). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2026-57232?
   • contao/contao (composer) (versions >= 5.3.35, < 5.3.48)
   • contao/core-bundle (composer) (versions >= 5.3.35, < 5.3.48)
4. Is there a fix for CVE-2026-57232? Yes. CVE-2026-57232 is fixed in 5.3.48, 5.7.9. Upgrade to this version or later.
5. Is CVE-2026-57232 exploitable, and should I be worried? Whether CVE-2026-57232 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-57232 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-57232?
   • Upgrade contao/contao to 5.3.48 or later
   • Upgrade contao/contao to 5.7.9 or later
   • Upgrade contao/core-bundle to 5.3.48 or later
   • Upgrade contao/core-bundle to 5.7.9 or later

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