Information disclosure in Contao - #VU134536
Published: June 15, 2026
Vulnerability identifier: #VU134536
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Contao
Affected software:
Contao
Contao
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to exposure of sensitive information in the crawler HTTP client options handling when crawling external links or configured additional URIs. A remote user can cause the crawler to request an attacker-controlled external URL to disclose sensitive information.
User interaction is required to have the crawler process an external URL, for example through a link on a crawled page while the broken-link checker is enabled.
Remediation
Install security update from vendor's website.