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fkie_cve-2026-55824

Contao is an Open Source CMS. In versions 4.13.40 through 5.3.46 and 5.7.0-RC1 through 5.7.6, the crawler leaks auth credentials to external hosts. Contao's crawler tries to prevent confidential HTTP client options from being sent to external domains by creating a scoped client: full options for root page origins, cleaned options for everything else. The cleaner removes Cookie and Authorization headers, but it removes the non-Symfony option names basic_auth and bearer_auth instead of Symfony HttpClient's real auth_basic and auth_bearer options. When contao.crawl.default_http_client_options contains Basic or Bearer authentication for a protected staging/production site, those credentials remain in the "clean" client used for external links or configured additional URIs. An attacker who can get an external URL crawled, for example through a link on a crawled page while the broken-link checker is enabled, can receive the crawler credentials. This issue has been fixed in versions 5.3.47 and 5.7.7.

GHSA-3mr9-p497-58f6 — Contao crawler leaks auth credentials to external hosts

Affected: Packagist: contao/contao, Packagist: contao/core-bundle

### Summary Contao's crawler tries to prevent confidential HTTP client options from being sent to external domains by creating a scoped client: full options for root page origins, cleaned options for everything else. The cleaner removes `Cookie` and `Authorization` headers, but it removes the non-Symfony option names `basic_auth` and `bearer_auth` instead of Symfony HttpClient's real `auth_basic` and `auth_bearer` options.

When `contao.crawl.default_http_client_options` contains Basic or Bearer authentication for a protected staging/production site, those credentials remain in the "clean" client used for external links or configured additional URIs. An attacker who can get an external URL crawled, for example through a link on a crawled page while the broken-link checker is enabled, can receive the crawler credentials.

## Technical Detail

### Root Cause

```php // core-bundle/src/Crawl/Escargot/Factory.php:175-209 @ e550b92a01ef625bd546e6c3956dd200af05ebf0 private function createHttpClient(array $options = []): HttpClientInterface { $options = array_merge_recursive( [ 'headers' => [ 'accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'user-agent' => self::USER_AGENT, ], 'max_duration' => 10, ], array_merge_recursive($this->getDefaultHttpClientOptions(), $options), );

$cleanOptions = $this->cleanOptionsFromConfidentialData($options);

if (…

WID-SEC-W-2026-1921 — Contao: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Contao ausnutzen, um Informationen offenzulegen.