Threats Tagged 'cve-2026-67581'

CVE-2026-67581 is an authentication bypass vulnerability in ZenHive mpp versions from 0.3.0 before 0.6.3. It allows an unauthenticated remote attacker to reuse a previously settled on-chain transfer to obtain paid resources without authorization. The vulnerability arises because the verification method accepts a transaction hash credential and matches transfers based only on token, recipient, and amount, without binding the proof to the specific challenge or preventing reuse. This enables replay attacks using publicly visible blockchain transactions.

Authentication Bypass by Capture-replay in ZenHive mpp allows an unauthenticated remote client to obtain paid resources by resubmitting one settled on-chain transfer. MPP.Methods.EVM.verify/2 accepts a transaction-hash credential and matches a transfer purely on token, to and amount (ERC-20) or to and value (native). It binds the proof neither to the challenge being verified nor to any record of prior use, and the generic MPP.Plug dedup store keys on challenge.id, which is regenerated for every 402 response. On a static-price route, a single historical transfer matching the charge therefore satisfies an unbounded number of later charges, including transfers an attacker can read off a public block explorer. This issue affects mpp: from 0.3.0 before 0.6.3.