Security Alert: Thirdweb Addresses Vulnerability in Web3 Smart Contracts Dec 6, 2023 Dec 6, 2023 Kelly Cromley http://1AZFjzw2#Nwf63pYaMWq#xIY
Market NewsDecember 6, 2023 by Kelly Cromley

Security Alert: Thirdweb Addresses Vulnerability in Web3 Smart Contracts

Thirdweb, a platform empowering developers to build Web3 apps, recently uncovered a security vulnerability within a widely used open-source library utilized by major blockchain companies for constructing smart contracts, particularly those associated with nonfungible tokens (NFTs). This revelation has prompted the company to take immediate action and has implications for various smart contracts across the Web3 industry.


Uncovering the Vulnerability:

Thirdweb disclosed on Monday that it first became aware of the security vulnerability through a post on X (formerly Twitter) on November 20. The vulnerability, affecting a range of smart contracts within the Web3 industry, including Thirdweb’s own, has not been exploited in any Thirdweb smart contracts, according to the company’s investigation. However, it has prompted the issuance of mitigation steps for certain pre-built smart contracts created on Thirdweb before November 22, 2023, at 7 pm PT.


The Significance of Smart Contracts:

Smart contracts play a pivotal role in the development of blockchain-based applications, forming the foundation for decentralized software operations in the Web3 or decentralized web realm. These pieces of software automatically execute when predefined conditions are met, providing a framework for tamper-proof peer-to-peer transactions across blockchains. They are integral to the creation of diverse applications, including decentralized financial platforms, token exchanges, and NFTs.


Impact on Smart Contracts:

The vulnerability identified by Thirdweb impacts pre-built smart contracts such as DropERC20, ERC721, ERC1155, and AirDrop20. To facilitate immediate action, Thirdweb has shared a comprehensive list of affected smart contracts on its website. Additionally, the company has made available a mitigation tool and vulnerability checker online.


Mitigation Steps and Collaboration:

While Thirdweb has refrained from disclosing the specific open-source library affected by the vulnerability to mitigate the risk of exploitation, it has communicated with the maintainers of the library. The company has also reached out to other teams it believes are affected by the same issue, sharing its findings and mitigation measures.


Industry Response:

Prominent players in the Web3 industry, including OpenSea, the largest NFT marketplace, and Coinbase Inc., the leading U.S. cryptocurrency exchange, have responded to Thirdweb’s announcement. OpenSea expressed collaboration with Thirdweb to assist affected collection owners, emphasizing changes tied to contract migration. Coinbase, informed by Thirdweb about affected NFT collections on Coinbase NFT, promptly engaged in understanding the vulnerability’s nature and possible mitigation strategies.


Security Measures and Future Steps:

In the aftermath of this security revelation, Thirdweb is seizing the opportunity to enhance its security measures. The company plans to double its bug bounty payouts, increasing them from $25,000 to $50,000 per bounty. Additionally, Thirdweb is implementing a more robust auditing process to proactively identify and address potential issues of this nature sooner in the development cycle.



While the security vulnerability has posed challenges for the industry and Thirdweb, the company is committed to turning this incident into an opportunity for strengthening security practices. As the Web3 landscape continues to evolve, the vigilance and responsiveness of key players become paramount to ensuring the integrity of blockchain-based applications and the broader ecosystem.

AuthorKelly Cromley

Kelly is our in house crytpto researcher, delving into the stories which matter from blockchains being used in the real world to new ico coming out.