CVE-2026-48599 (GCVE-0-2026-48599)

Vulnerability from cvelistv5 – Published: 2026-06-15 21:55 – Updated: 2026-06-16 14:46
VLAI
Title
Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding
Summary
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.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
EEF
Impacted products
Vendor Product Version
elixir-grpc grpc Affected: 0.8.0 , < 1.0.0 (semver)
    cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*
Create a notification for this product.
elixir-grpc grpc Affected: 8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048 , < 33b6a095dbc91c6dee3c7b90893d7d74952e82e4 (git)
    cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Peter Ullrich Paulo Valente Jonatan Männchen
Show details on NVD website

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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