Threats Tagged 'cve-2026-73136'

CVE-2026-73136 is an authentication bypass vulnerability in ZenHive mpp versions 0.6.1 up to but not including 0.6.4. It allows an unauthenticated attacker to replay a previously settled transfer to obtain paid resources without authorization. The flaw arises because a static memo configuration disables proper binding of transfers to authentication challenges, enabling replay attacks using public transfer data.

Authentication Bypass by Capture-replay in ZenHive mpp allows an unauthenticated third party to obtain paid resources by replaying a transfer settled by an unrelated payer. MPP.Methods.Tempo normally binds a settled TIP-20 TransferWithMemo to the specific challenge under verification through an attribution nonce carried in the memo. When a static "memo" is configured in method_config, check_matched_memo_binding/3 returns the match unconditionally and that binding is skipped, leaving only token, recipient, amount and the static memo value to match on. The static memo is echoed in every unauthenticated 402 response and Tempo transfers are public, so an attacker can take any matching transfer paid by a legitimate customer, request a fresh challenge for the same route, and present that transaction hash as a type="hash" credential. The hash path performs no sender or signature check tying the presenter to the wallet that broadcast the transfer. This issue affects mpp: from 0.6.1 before 0.6.4.