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0xCERT Security Advisory 0xCERT-2026-0255
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Advisory-ID:  0xCERT-2026-0255
Severity:     Medium
Published:    2026-10-17T00:00:00.000Z
Updated:      2026-10-19T07:23:32.539Z
Chains:       BNB Chain, Ethereum
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0255

Title: Cysic Bridge Unbacked CYS Mint

Summary
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An attacker abused Cysic's bridge to mint 10 million unbacked CYS on BNB Chain, dumping most of it for about $727,000 in ETH before the token could be blacklisted.

Details
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Summary
An attacker abused Cysic's bridge to mint 10 million unbacked CYS on BNB Chain, dumping most of it for about $727,000 in ETH before the token could be blacklisted.

Incident
- - Victim: Cysic
- - Date (UTC): 2026-10-17
- - Estimated loss: $727k
- - Chain(s): BNB Chain, Ethereum
- - Attack type: bridge exploit
- - Funds status: stolen
- - Attacker: 0xA4e1827Fe2664fD0797a55e442b2e2639449C255

Recommended actions
- - Revoke token approvals granted to Cysic contracts until the project confirms they are safe
- - Integrators: pause or delist affected assets and monitor for attacker fund movements
- - Beware of follow-on phishing: ignore unofficial "refund", "recovery", or "claim" links and DMs; use the project's verified channels only

Source & attribution
Full analysis on Blockchain Breaches, 0xCERT's incident archive: https://www.blockchainbreaches.com/en/breaches/cysic-2026. Primary sources: https://www.cryptotimes.io/2026/10/19/cysic-bridge-hack-attacker-mints-10m-cys-moves-727k-to-ethereum/ ; https://cryptoadventure.com/cysic-halts-bridge-after-10-million-cys-exploit-sends-727k-to-ethereum/.

References
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- - https://www.blockchainbreaches.com/en/breaches/cysic-2026
- - https://www.cryptotimes.io/2026/10/19/cysic-bridge-hack-attacker-mints-10m-cys-moves-727k-to-ethereum/
- - https://cryptoadventure.com/cysic-halts-bridge-after-10-million-cys-exploit-sends-727k-to-ethereum/

Verify with the 0xCERT OpenPGP key: https://www.0xcert.com/pgp.asc
Fingerprint: 5F94 3ED1 1E50 CF31 2128  C493 CCC7 D9EC 9415 723D

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