Technical Overview
A P2P wallet-transfer endpoint accepted sender and receiver information directly from the client request.
Testing demonstrated that the backend did not sufficiently verify that the authenticated user was authorized to initiate the transaction from the specified source account.
A separate review of transaction processing also identified insufficient idempotency controls around repeated payment requests.
Impact
A business-logic weakness created a potential path to unauthorized wallet transactions and transaction duplication.
Recommendation
Derive transaction ownership exclusively from the authenticated server-side session, validate authorization before every transaction, and enforce atomic idempotency controls at the database layer.
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