evidence-backed-review

The module does not show signs of supply-chain malware (no obfuscation, no persistence, no exfiltration), but it contains high-impact application security vulnerabilities: (1) likely IDOR in getInvoiceById due to missing ownership validation against req.user.id and (2) path traversal / unsafe file-write risk in uploadReceiptAttachment due to unsanitized user-controlled filename used to form a filesystem destination passed to storage.save. These issues can directly lead to unauthorized data access and potentially arbitrary file writes, depending on storage behavior.