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Path Traversal occurrences in Webid
WeBid version up to current version 1.2.2 contains a Directory Traversal vulnerability in getthumb.php that can result in Arbitrary Image File Read. This attack appear to be exploitable via HTTP GET Request. This vulnerability appears to have been fixed in after commit 256a5f9d3eafbc477dcf77c7682446cc4b449c7f. (2018-12-20, CVE-2018-1000882)
Why Path Traversal can be dangerous
Relative Path Confusion means that your web server is configured to serve responses to ambiguous URLs. This configuration can possibly cause confusion about the correct relative path for the URL. It is also an issue of resources, such as images, styles etc., which are specified in the response using relative path, not the absolute URL.
If the web browser permits to parse "cross-content" response, the attacker may be able to fool the web browser into interpreting HTML into other content types, which can then lead to a cross site scripting attack (link do XSS).