YOURLS vulnerabilities

YOURLS prior to 1.10.5 does not sanitize the request path in yourls_get_request(), so dot and slash traversal sequences are preserved and reach file_exists() and include() under YOURLS_PAGEDIR. An unauthenticated remote attacker can traverse outside the pages directory and include a local PHP file already present on the server, causing it to execute in the YOURLS web process. The issue is fixed in version 1.10.5.

YOURLS, a self-hosted, customizable URL shortener written in PHP, from version 1.5.1 until 1.10.4 stores the HTTP Referer header and aggregates it in statistics, then passes it to the chart builder which concatenates labels into inline JavaScript without proper escaping. This allows an unauthenticated attacker to poison the statistics of an existing short URL with a crafted referrer, leading to execution of malicious JavaScript in the YOURLS origin when an administrator or public stats-page viewer opens the affected page. This issue is fixed in version 1.10.4.

Multiple stored XSS vulnerabilities exist in the YOURLS Admin Panel, versions 1.5-1.7.10. An authenticated user can inject malicious code by modifying a PHP plugin and uploading it.