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ONE 
SAND 
XRP Sandbox suspends SAND bridging, attacker exploits cross-chain vulnerability to minting unsecured tokens
The Sandbox has suspended SAND bridging services on Base and BNB smart chains after an attacker used its cross-chain infrastructure to minting unsecured tokens. SAND on these two networks are currently isolated and the project company is investigating the intrusion.
Theteam stated that the underlying SAND locked on Ethereum remains safe and continues to support legal bridging tokens. The Ethereum and Polygon networks were not affected, and user wallets were not compromised.
According to estimates by The Sandbox, the actual impact will not be 0.01% of the total SAND supply. This figure is a huge difference from the number of fraudulent tokens nominally minted: security firm Blockaid estimates that SAND minted at approximately $49 billion based on face value in more than 400 transactions. PeckShield, another security agency, marked that approximately 14.9 billion SAND were minted to two addresses.
SAND on the Base and BNB chains are quarantined
The project party has disabled the transfer-in and transfer-out functions on the Base and BNB smart chains to prevent newly minted tokens from being redeemed or returned to the mortgaged assets on Ethereum through bridges.
Users are advised not to buy, sell or trade SAND on these two affected networks because their liquidity has been compromised. The Sandbox is also preparing to take a snapshot before the incident occurs and said it will compensate eligible liquidity providers.
This incident once again highlights that cross-chain infrastructure is still a recurring attack surface. A security review of cryptocurrency hacking incidents in July found multiple bridge-related incidents among the $247.4 million crypto thefts reported that month.
Similar vulnerabilities continued to appear in August. A recent vulnerability in Coreum Bridge resulted in the withdrawal of nearly 200,000 XRPs, but the XRP ledger verifier key was not affected; and Harmony was forced to suspend its bridging service after suspected unauthorized minting of approximately 4 billion ONE tokens.
South Korea's major exchanges suspend SAND transfers
This security incident also prompted South Korea's major exchanges to take action. Bithumb suspended SAND's recharge and withdrawal at 11:11 on August 22, Korean time, and Upbit followed up one minute later. Both exchanges cited security concerns under South Korea's Virtual Asset User Protection Act.
Upbit initially also suspended Ethereum-based SAND transfers, but The Sandbox later stated that tokens on Ethereum were never exposed to the vulnerability.
This incident has added new security challenges to the team, which is still a well-known project among Metaverse Tokens. SAND serves as a utility token and trading token for The Sandbox ecosystem, covering virtual land, digital assets, and experiences built by creators.
The Sandbox said it will release a complete review report after completing the investigation. Until the bridge is restored, SAND on the Base and BNB smart chains will remain isolated from the Ethereum and Polygon markets that have not been affected by the project.
