# Tutorial 67: ERC1155 Vulnerabilities {% hint style="info" %} [**Book an audit with Zokyo**](https://www.zokyo.io/) {% endhint %} As we dive deeper into the world of NFTs and blockchain technology, it's important to expand our focus beyond the popular ERC-721 standard to cover other essential NFT standards, like **ERC-1155**. The **ERC-1155** standard offers enhanced functionality by supporting both fungible and non-fungible tokens in a single contract, making it a versatile option for developers. However, with this flexibility comes additional complexities and potential vulnerabilities. In this section, we'll explore key vulnerabilities that can arise when using the ERC-1155 standard. From improper handling of transfers to compatibility issues and security flaws in contract design, understanding these risks is crucial for ensuring robust and secure applications. By analyzing these vulnerabilities, we aim to help developers and auditors safeguard their projects and maintain the integrity of their NFT ecosystems. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://zokyo-auditing-tutorials.gitbook.io/zokyo-tutorials/tutorial-67-erc1155-vulnerabilities.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.