CVE-2025-62784 is a vulnerability classified under CWE-837 (Improper Enforcement of a Single, Unique Action) found in the InventoryGui library versions prior to 1.6.5. InventoryGui is a popular library used by Bukkit/Spigot plugins to create chest-based graphical user interfaces (GUIs) within Minecraft servers. The vulnerability specifically occurs when a plugin uses the GuiStorageElement component that permits players to take items out of the GUI element, combined with the server enabling the experimental Bundle item feature. This combination allows an attacker with low privileges (no authentication beyond normal player access) to duplicate items by exploiting improper enforcement of unique actions within the GUI logic. The duplication flaw impacts data integrity by allowing unauthorized replication of in-game items, which can disrupt game economy and fairness. The vulnerability does not require user interaction and can be exploited remotely over the network. The CVSS 4.0 score of 5.3 reflects a medium severity, considering the ease of exploitation and limited scope of impact (integrity only). No known exploits have been reported in the wild as of the publication date. The issue is resolved in InventoryGui version 1.6.5, which enforces proper single-action constraints to prevent duplication. Server administrators are advised to upgrade to this version or disable the experimental Bundle feature to mitigate risk.

For European organizations operating Minecraft servers, especially those hosting multiplayer environments with Bukkit/Spigot plugins, this vulnerability can undermine the integrity of in-game economies by enabling item duplication. This can lead to unfair advantages, loss of player trust, and potential financial losses if the server monetizes in-game items or relies on a balanced economy. While the vulnerability does not compromise confidentiality or availability, the integrity breach can disrupt gameplay and server reputation. Educational institutions, gaming communities, and commercial server operators in Europe could face reputational damage and user dissatisfaction. The impact is primarily economic and operational within the gaming context rather than broader IT infrastructure compromise.

1. Upgrade all instances of the InventoryGui library to version 1.6.5 or later, where the vulnerability is fixed. 2. If immediate upgrade is not feasible, disable the experimental Bundle item feature on Minecraft servers to prevent exploitation. 3. Audit all Bukkit/Spigot plugins using InventoryGui to identify those utilizing GuiStorageElement with item removal capabilities. 4. Implement monitoring for unusual item duplication patterns or inventory anomalies to detect potential exploitation attempts. 5. Educate server administrators and plugin developers about the vulnerability and encourage timely patching. 6. Consider restricting plugin permissions and server access to minimize the risk of exploitation by low-privilege users. 7. Regularly review plugin dependencies and update them as part of a comprehensive patch management process.