CVE-2025-62782 is a vulnerability identified in the InventoryGui library, a tool widely used for creating chest graphical user interfaces (GUIs) in Bukkit/Spigot Minecraft server plugins. The affected versions are 1.6.3-SNAPSHOT and earlier. The vulnerability arises from improper enforcement of a single, unique action within the GuiStorageElement component when the experimental Bundle item feature is enabled on the server. This flaw allows attackers or users with low privileges to duplicate items within the game environment by exploiting the GUI's handling of storage elements, violating the intended uniqueness constraint of certain actions. The vulnerability is classified under CWE-837, which pertains to improper enforcement of a single, unique action, leading to unintended repeated operations. The CVSS 4.0 base score is 5.9 (medium severity), reflecting network attack vector, low attack complexity, partial privileges required, and user interaction needed. The impact on confidentiality is none, but integrity impact is high due to item duplication, with low availability impact. The vulnerability does not require elevated privileges beyond low-level access and is exploitable remotely over the network. No known exploits have been reported in the wild as of the publication date (October 27, 2025). The issue is resolved in InventoryGui version 1.6.4-SNAPSHOT, which enforces proper uniqueness of actions and prevents item duplication. This vulnerability primarily affects Minecraft server administrators and plugin developers who rely on InventoryGui for GUI management.

For European organizations operating Minecraft servers, especially those providing multiplayer gaming services or hosting competitive or economy-driven servers, this vulnerability can have significant consequences. Item duplication undermines the integrity of in-game economies, potentially leading to inflation of virtual goods, loss of player trust, and reputational damage. Servers that monetize in-game items or rely on virtual economies for revenue generation could suffer financial losses. Additionally, duplicated items might be used to gain unfair advantages, disrupting gameplay balance and community fairness. While the vulnerability does not directly affect confidentiality or availability, the integrity compromise can indirectly impact service quality and user retention. Given the popularity of Minecraft in Europe, particularly in countries with large gaming communities and server hosting infrastructure, the threat is relevant. However, the absence of known exploits in the wild reduces immediate risk, though proactive mitigation is advised to prevent future exploitation.

1. Upgrade InventoryGui to version 1.6.4-SNAPSHOT or later immediately to apply the official patch that fixes the vulnerability. 2. If immediate patching is not possible, disable the experimental Bundle item feature on the server to prevent the exploitation vector. 3. Review and audit server plugins and configurations to ensure no other components enable similar experimental features that might introduce vulnerabilities. 4. Implement monitoring and logging of inventory-related actions to detect unusual item duplication patterns or anomalies. 5. Educate server administrators and plugin developers about the risks associated with enabling experimental features without thorough testing. 6. Regularly update all server software and plugins to their latest versions to minimize exposure to known vulnerabilities. 7. Consider implementing rate limiting or additional validation on GUI interactions to reduce the risk of abuse. 8. Engage with the Minecraft server community and plugin developers to stay informed about emerging threats and patches.