A Server-Side Request Forgery (SSRF) vulnerability in the /Cover/Show route (showAction in CoverController.php) in Open Library Foundation VuFind 2.4 through 9.1 before 9.1.1 allows remote attackers to access internal HTTP servers and perform Cross-Site Scripting (XSS) attacks by proxying arbitrary URLs via the proxy GET parameter.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.