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.
CVSS
No CVSS.
References
Configurations
No configuration.
History
16 Jun 2026, 15:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/elixir-grpc/grpc/security/advisories/GHSA-mwr4-5g34-j5cq - |
15 Jun 2026, 23:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-15 23:16
Updated : 2026-06-17 10:55
NVD link : CVE-2026-48599
Mitre link : CVE-2026-48599
CVE.ORG link : CVE-2026-48599
JSON object : View
Products Affected
No product.
CWE
CWE-639
Authorization Bypass Through User-Controlled Key