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The CVE-2025-XXXXX vulnerability in InventoryGui stems from improper access control within the `GuiStorageElement` component. This element is designed to provide a direct view into a plugin’s internal storage, such as a chest. The flaw occurs when a player interacts with a GUI containing a GuiStorageElement. Due to insufficient validation, the player is permitted to extract items from this storage view and place them into their own inventory. This action is not properly synchronized with the server’s authoritative state. Consequently, the client’s inventory is updated, but the server does not register the removal of these items from the storage container. This state desynchronization allows a malicious user to duplicate the extracted items simply by closing and reopening the GUI, as the `GuiStorageElement` will still contain the original, undeducted items, while the player also retains the copied items in their personal inventory.
Platform: Minecraft Server Plugins
Version: <1.6.5
Vulnerability: Item Duplication
Severity: Moderate
date: 2025-10-26
Prediction: 2025-11-02
What Undercode Say:
Simulating item count check grep -r "GuiStorageElement" /plugin/src/
// Example of vulnerable interaction flow
public void onInventoryClick(InventoryClickEvent event) {
if (event.getSlot() instanceof GuiStorageElement) {
// Flaw: Item taken without server-side storage update
ItemStack takenItem = event.getCurrentItem().clone();
player.getInventory().addItem(takenItem); // Item duplicated
}
}
How Exploit:
1. Open a GUI containing a GuiStorageElement.
- Drag items from the storage view into the player inventory.
3. Close the GUI without any other action.
- Reopen the GUI to find the original items still present, effectively duplicating them.
Protection from this CVE:
Update InventoryGui to version 1.6.5 or later. For versions before 1.21.9, disable the GuiStorageElement feature entirely. Alternatively, modify plugins to avoid using the GuiStorageElement component.
Impact:
Unauthorized item duplication leading to economy disruption on multiplayer servers. Exploitation is straightforward, requiring no special permissions, affecting any server using a vulnerable plugin version with the GuiStorageElement.
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
