Multiple Cross-Site Scripting (XSS) were discovered in Gazelle before 2017-03-19. The vulnerabilities exist due to insufficient filtration of user-supplied data (torrents, size) passed to the 'Gazelle-master/sections/tools/managers/multiple_freeleech.php' URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.
Polish
English