{"id":"CVE-2026-55824","summary":"Contao crawler leaks auth credentials to external hosts","details":"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.","aliases":["GHSA-3mr9-p497-58f6"],"modified":"2026-09-10T03:31:03.171511977Z","published":"2026-07-31T19:04:00.322Z","database_specific":{"cwe_ids":["CWE-200"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55824.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55824.json"},{"type":"ADVISORY","url":"https://github.com/contao/contao/security/advisories/GHSA-3mr9-p497-58f6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55824"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/contao/contao","events":[{"introduced":"1789b18b3d2b56c0dd17dc45e870c472a47d536f"},{"fixed":"d15cef522333228b1815fad5e75c7779599e5ccd"},{"introduced":"076a011a04cfee96a4873e1612a1faed4d82e903"},{"fixed":"1f8131ccf1950bba4130884e7320b649223dcfc3"}],"database_specific":{"extracted_events":[{"introduced":"4.13.40"},{"fixed":"5.3.47"},{"introduced":"5.7.0-RC1"},{"fixed":"5.7.7"}],"source":"AFFECTED_FIELD"}}],"versions":["5.7.6","5.7.5","5.7.4","5.7.3","5.7.2","5.7.1","5.7.0","5.7.0-RC4","5.7.0-RC3","5.7.0-RC2","5.7.0-RC1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55824.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N"}]}