The vulnerability identified as CVE-2025-62782 affects the Phoenix616 InventoryGui library, a tool widely used in Bukkit/Spigot Minecraft server plugins to create chest graphical user interfaces (GUIs). Specifically, versions 1.6.3-SNAPSHOT and earlier contain a flaw classified under CWE-837 (Improper Enforcement of a Single, Unique Action). This flaw arises when GUIs utilize the GuiStorageElement component in conjunction with the experimental Bundle item feature enabled on the server. The vulnerability allows attackers or users with limited privileges to duplicate items within the game environment by bypassing the intended single-action enforcement mechanism. This duplication occurs because the system fails to properly restrict repeated execution of the same action, leading to multiple instances of items being created illegitimately. The impact primarily affects the integrity of the game state, as duplicated items can disrupt in-game economies, cause unfair advantages, and potentially destabilize server operations. Exploitation requires some user interaction and low privileges, making it accessible to regular players rather than only administrators. The vulnerability does not affect confidentiality or availability directly but poses a significant risk to game integrity and fairness. The issue was addressed and resolved in version 1.6.4-SNAPSHOT of InventoryGui. No known exploits have been reported in the wild as of the publication date, but the medium CVSS score of 5.9 reflects the moderate risk posed by this vulnerability.

For European organizations operating Minecraft servers, particularly those using Bukkit/Spigot platforms with the Phoenix616 InventoryGui library, this vulnerability can have several adverse effects. Item duplication can undermine the integrity of in-game economies, leading to loss of player trust and potential financial impacts if servers monetize in-game assets or rely on player engagement. It may also cause server instability or increased administrative overhead to detect and remediate duplicated items. Competitive gaming communities and educational institutions using Minecraft for learning could face disruptions. While the vulnerability does not compromise sensitive data or server availability directly, the integrity impact can indirectly affect reputation and operational continuity. Given the popularity of Minecraft servers across Europe, especially in countries with large gaming communities, the threat is relevant and warrants timely mitigation.

To mitigate this vulnerability, affected organizations should promptly update the Phoenix616 InventoryGui library to version 1.6.4-SNAPSHOT or later, where the issue is resolved. Server administrators should audit their plugin configurations to verify whether the experimental Bundle item feature is enabled and consider disabling it if not essential. Implementing strict access controls to limit plugin configuration changes to trusted administrators can reduce exploitation risk. Monitoring server logs for unusual item duplication patterns can help detect attempted exploitation. Additionally, server operators should educate users about the risks of interacting with untrusted GUIs and maintain regular backups to restore server state if necessary. Applying these targeted measures will reduce the likelihood and impact of exploitation beyond generic patching advice.