Minecraft MOTD Parser is a PHP library to parse minecraft server motd. The HtmlGenerator class is subject to potential cross-site scripting (XSS) attack through a parsed malformed Minecraft server MOTD. The HtmlGenerator iterates through objects of MotdItem that are contained in an object of MotdItemCollection to generate a HTML string. An attacker can make malicious inputs to the color and text properties of MotdItem to inject own HTML into a web page during web page generation. For example by sending a malicious MOTD from a Minecraft server under their control that was queried and passed to the HtmlGenerator. This XSS vulnerability exists because the values of these properties are neither filtered nor escaped. This vulnerability is fixed in 1.0.6.

Minecraft through 1.19 and 1.20 pre-releases before 7 (Java) allow arbitrary file overwrite, and possibly code execution, via crafted world data that contains a symlink.

McWebserver mod runs a simple HTTP server alongside the Minecraft server in seperate threads. Path traversal in McWebserver Minecraft Mod for Fabric and Quilt up to and including 0.1.2.1 and McWebserver Minecraft Mod for Forge up to and including 0.1.1 allows all files, accessible by the program, to be read by anyone via HTTP request. Version 0.2.0 with patches are released to both platforms (Fabric and Quilt, Forge). As a workaround, the McWebserver mod can be disabled by removing the file from the `mods` directory.

Minecraft before 1.17.1, when online-mode=false is configured, allows path traversal for deletion of arbitrary JSON files.

install.php in Minecraft Servers List Lite before commit c1cd164 and Premium Minecraft Servers List before 2.0.4 does not sanitize input before saving database connection information in connect.php, which might allow remote attackers to execute arbitrary PHP code via the (1) database_server, (2) database_user, (3) database_password, or (4) database_name parameter.