Bitget traces $387.5 million breach to stolen internal credentials via third-party product flaw

The attack path Bitget described is the one every exchange should assume is live against its own stack. Gracy Chen said the attacker exploited a vulnerability in a third-party security product to obtain high-level internal credentials, then used those credentials to issue fraudulent withdrawal commands that bypassed the exchange's risk controls ^[2][6]. The failure sat between the vendor's product and Bitget's own withdrawal logic. Most custody counterparties do not test that seam, because it is somebody else's code. Private keys were not compromised and the cold wallets were untouched ^[3].

The remediation Bitget listed is a checklist of what the controls did not do before. It restricted internal access, added independent verification for withdrawals, and increased monitoring for unusual activity ^[7]. Independent verification for withdrawals is the one that matters here, because a single set of stolen internal credentials was enough to sign off hot-wallet transfers without a second, out-of-band check.

The money side is more legible than the forensics. The loss started at about $352 million on detection at 18:31 UTC on September 24 ^[4][8], and rose to roughly $387.5 million once Bitget accounted for additional Zcash and TRON transfers, which the exchange framed as a fuller count rather than fresh theft ^[1][5]. The Protection Fund held more than $464 million when the incident was first disclosed ^[12], so the loss was about 83 percent of the fund ^[21]. Chen said Bitget will replenish the fund with its own capital to bring it back above $300 million within a week ^[13], a floor the exchange has committed to before ^[14]. Its August report put the fund's average monthly value at $382 million ^[15].

Bitget has not published a recovery number. Some assets have been frozen with help from other industry participants, but the exchange said it would release a total only after verifying the amounts ^[16]. On the earlier suspicion of a North Korea link, Chen said: "What was shared previously was based on preliminary indicators identified during the investigation" ^[9], and that "those indicators are still being assessed. Mandiant and SlowMist are supporting the independent forensic investigation, and that work is ongoing. We will share further findings as they are verified" ^[10].

There is a live dispute over how the stolen funds are moving. Bitget had asked THORChain, a cross-chain swap protocol, to refuse service to addresses tied to the attack; THORChain has said it cannot selectively blacklist individual addresses ^[17]. Chen said the exchange is not asking any protocol to do the technically impossible: "We understand that THORChain operates as a decentralized protocol and has said that it cannot selectively blacklist individual addresses. We respect the technical constraints of different networks and are not asking any protocol to take actions that are not technically possible" ^[18].

Bitcoin withdrawals are back. Bitget processed 9,585 orders totaling 4,098.036 BTC as of 17:00 UTC+8 on Monday, with ether, USDT and other assets phased back through October 2 ^[11][19]. Chen called this Bitget's first incident of this kind in eight years ^[20]. In my view, a custody firm's attack surface now includes the security products it buys, and the one control that would have caught this was a second verifier on the withdrawal itself.