Authorization Bypass Through User-Controlled Key Affecting grpc_server package, versions <1.0.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-HEX-GRPCSERVER-17344423
- published16 Jun 2026
- disclosed15 Jun 2026
- creditPeter Ullrich
Introduced: 15 Jun 2026
NewCVE-2026-48599 (opens in a new tab)How to fix?
Upgrade grpc_server to version 1.0.0 or higher.
Overview
grpc_server is a GRPC is a fully featured Elixir implementation of the gRPC protocol (grpc.io), enabling efficient communication between services through a unified and stream-oriented API. It supports all RPC types, friendly error handling, TLS, interceptors, reflection, and optional HTTP transcoding.
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the map_request endpoint. An authenticated attacker who can reach a transcoded endpoint can gain unauthorized access to or modify resources belonging to other users by supplying a conflicting value for any path-bound field via the query string or request body, causing the attacker-supplied value to override the intended router-extracted value.
Note: An authenticated attacker can read or modify any other user's resources exposed via transcoded endpoints.