CVE-2026-48599— elixir-grpc gRPC Elixir 授权问题漏洞

Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding

Authorization Bypass Through User-Controlled Key vulnerability in elixir-grpc grpc allows authenticated attackers to access or modify resources belonging to other users by smuggling a conflicting value for any path-bound field via the query string or request body. In 'Elixir.GRPC.Server.Transcode':map_request/5 (lib/grpc/server/transcode.ex), all three clauses use Map.merge/2 with path bindings as the first argument, giving them the lowest merge precedence. A request such as GET /users/me/profile?user_id=victim (or a POST with {"user_id": "victim"} when body: "*") yields a decoded protobuf struct where the path-bound field carries the attacker-supplied value rather than the router-extracted value. Any handler that uses the path-bound field for authorization, multi-tenancy scoping, or ownership checks is silently bypassed. This issue affects grpc from 0.8.0 before 1.0.0.

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通过用户控制密钥绕过授权机制

elixir-grpc gRPC Elixir 授权问题漏洞

elixir-grpc gRPC Elixir是elixir-grpc组织的一款基于Elixir语言构建的gRPC框架。 elixir-grpc gRPC Elixir 0.8.0版本至1.0.0之前版本存在授权问题漏洞，该漏洞源于在'Elixir.GRPC.Server.Transcode':map_request/5函数中对Map.merge/2的参数处理不当，使得路径绑定作为第一个参数优先级最低，允许通过查询字符串或请求体注入冲突值，导致授权绕过。以下版本受到影响：0.8.0版本至1.0.0之前版本

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