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The vulnerability arises due to improper input sanitization and a missing boundary check within the application’s image processing logic. Specifically, the ImagesController takes a user-supplied path parameter and joins it onto the configured target image directory using Path::join(). While this function properly handles and canonicalizes standard dot-dot segments, the controller fails to subsequently call Path::isBasePath() to verify whether the final resolved path stays strictly within the intended base directory confines. Consequently, an unauthenticated attacker can craft specialized HTTP GET requests incorporating percent-encoded dot segments. These traversal sequences successfully bypass the directory boundary constraints, allowing the underlying application to locate files residing outside the designated folder. The resulting file content is then retrieved and returned directly to the requester through a BinaryFileResponse mechanism. Although access is bounded to specific file extensions defined under the configuration parameter and certain paths encounter other handling blocks, the lack of complete path validation exposes a significant structural flaw. Both Apache web servers configured via standard htaccess rules and Nginx implementations using standard setups are fully susceptible to this exposure vector.
DailyCVE Form:
Platform: Contao CMS
Version: All prior
Vulnerability : Path Traversal
Severity: Medium
date: 2026-08-25
Prediction: 2026-09-01
What Undercode Say:
Showing bash commands and codes related to the blog and another headings how Exploit: (Educational Purposes!)
curl -s “https://target.com/images/%2e%2e/%2e%2e/config/parameters.yaml”
Protection: from this CVE
Update Contao framework
Impact:
Information Disclosure
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Sources:
Reported By: github.com
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