Contao is an Open Source CMS

Overview

Contao is an Open Source CMS. From 5.3.35 through 5.3.47 and from 5.7.0-RC1 through 5.7.8, the Feed Reader front-end module passes configured RSS feed URLs from FeedReaderController::getResponse() to feedIo->read() without scheme or private-address validation, allowing a backend user with module-edit permissions to make the server request internal network services, loopback addresses, or cloud metadata endpoints. In core-bundle/src/Controller/FrontendModule/FeedReaderController.php, the getResponse() function iterates over the configured feed URLs and passes each one directly to the HTTP client (via $this->feedIo->read($url, new Feed())) with no validation, while the DCA field definition for rss_feed in tl_module.php carries no URL scheme or host validation and the HTTP client is wired as @psr18.http_client (Symfony HttpClient) with no SSRF protection configured, since NoPrivateNetworkHttpClient is not used. This issue is fixed in versions 5.3.48.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Package advisory (CVE-2026-57232)

Affected packages:

• contao/contao >= 5.3.35, < 5.3.48
• contao/contao >= 5.4.0, < 5.7.9
• contao/core-bundle >= 5.3.35, < 5.3.48
• contao/core-bundle >= 5.4.0, < 5.7.9

Patched in:

• contao/contao 5.3.48
• contao/contao 5.7.9
• contao/core-bundle 5.3.48
• contao/core-bundle 5.7.9

Source: https://github.com/advisories/GHSA-87mg-5grr-rhwh