- Cysic suspended its cross-chain bridge after an unauthorized mint of 10 million CYS on BNB Smart Chain.
- The project said the incident was limited to bridge message processing and minting and did not affect the mainnet or user wallets.
Cysic halted the Cysic bridge after an attacker exploited a processing flaw and minted 10 million CYS on BNB Smart Chain, according to a Sunday incident report posted on X. The foundation said preliminary findings point to unauthorized access to a database that supports the bridge. It added that the issue was confined to bridge message processing and minting, while the mainnet and other operational systems were not affected. Cysic also said the incident did not lead to the theft or unauthorized transfer of existing CYS or other assets in user wallets. The project is still reviewing transfers, swaps and the actual losses tied to the event.
Cysic bridge suspension details
Cysic said the exploit took place on Saturday and led to the suspension of the Cysic bridge. The unauthorized mint happened at 12:31:38 UTC on Oct. 17 on BNB Smart Chain. In its report, the foundation said the bridge was halted after the attacker took advantage of a flaw in message processing.
The project said its early review suggests unauthorized access to a database that supports the bridge. Cysic later added the recipient address to the token contract blacklist at 13:47:52 UTC. It said about 2.8 million CYS remained at that address, where transfers were restricted.
Scope of the incident
According to Cysic, the event was limited to bridge message processing and minting. The foundation said the mainnet and other operational systems were not affected by the incident, drawing a distinction between the compromised bridge process and the rest of the network’s operations.
Cysic also said the incident did not result in theft or unauthorized movement of existing CYS or other assets held in user wallets. The foundation emphasized that the mint size by itself does not determine the final dollar impact, with transfers, swaps and actual losses still under review.
Cysic bridge token impact under review
The foundation said the unauthorized issuance involved 10 million CYS on BNB Smart Chain. About 160.8 million tokens are in circulation, according to CoinMarketCap data cited in the report. CYS is used to coordinate incentives for users, compute providers, governance participants and contributors in the Cysic network, based on the project’s tokenomics documentation.
Cysic said the amount minted alone does not establish the final loss tied to the incident. The project is continuing to assess token transfers, swaps and any realized damage. It also said it has hired an unnamed security firm and plans to publish a follow-up report after the current phase of the investigation.
Conclusion
The Cysic bridge remains at the center of the project’s investigation after the unauthorized mint of 10 million CYS on BNB Smart Chain. Cysic said the issue stemmed from a flaw in bridge message processing, with preliminary findings pointing to unauthorized database access. The foundation has already blacklisted the recipient address, where about 2.8 million CYS remained with transfers restricted. At the same time, it said the incident did not affect the mainnet or other operational systems and did not involve the theft of existing user-held assets. A security firm has been brought in, and a follow-up report is planned after the current review is completed.
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