{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-48599", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-05-22T09:36:56.834Z", "datePublished": "2026-06-15T21:55:28.702Z", "dateUpdated": "2026-09-24T21:04:08.766Z" }, "containers": { "cna": { "affected": [ { "collectionURL": "https://repo.hex.pm", "cpes": [ "cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "'Elixir.GRPC.Server.Transcode'" ], "packageName": "grpc", "packageURL": "pkg:hex/grpc", "product": "grpc", "programFiles": [ "lib/grpc/server/transcode.ex" ], "programRoutines": [ { "name": "'Elixir.GRPC.Server.Transcode':map_request/5" } ], "repo": "https://github.com/elixir-grpc/grpc", "vendor": "elixir-grpc", "versions": [ { "lessThan": "1.0.0", "status": "affected", "version": "0.8.0", "versionType": "semver" } ] }, { "collectionURL": "https://github.com", "cpes": [ "cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "'Elixir.GRPC.Server.Transcode'" ], "packageName": "elixir-grpc/grpc", "packageURL": "pkg:github/elixir-grpc/grpc", "product": "grpc", "programFiles": [ "lib/grpc/server/transcode.ex" ], "programRoutines": [ { "name": "'Elixir.GRPC.Server.Transcode':map_request/5" } ], "repo": "https://github.com/elixir-grpc/grpc", "vendor": "elixir-grpc", "versions": [ { "lessThan": "33b6a095dbc91c6dee3c7b90893d7d74952e82e4", "status": "affected", "version": "8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048", "versionType": "git" } ] } ], "configurations": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

HTTP-to-gRPC transcoding must be enabled.

" }, { "base64": false, "type": "text/markdown", "value": "HTTP-to-gRPC transcoding must be enabled." } ], "value": "HTTP-to-gRPC transcoding must be enabled." } ], "cpeApplicability": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.0.0", "versionStartIncluding": "0.8.0", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "AND" } ], "credits": [ { "lang": "en", "type": "finder", "value": "Peter Ullrich" }, { "lang": "en", "type": "remediation developer", "value": "Paulo Valente" }, { "lang": "en", "type": "analyst", "value": "Jonatan Männchen / EEF" } ], "datePublic": "2026-06-15T21:55:28.000Z", "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

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.

\n

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.

\n

This issue affects grpc: from 0.8.0 before 1.0.0.

" }, { "base64": false, "type": "text/markdown", "value": "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.\n\nIn `'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.\n\nThis issue affects grpc: from 0.8.0 before 1.0.0." } ], "value": "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.\n\nIn '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.\n\nThis issue affects grpc: from 0.8.0 before 1.0.0." } ], "impacts": [ { "capecId": "CAPEC-460", "descriptions": [ { "lang": "en", "value": "CAPEC-460 HTTP Parameter Pollution (HPP)" } ] } ], "metrics": [ { "cvssV4_0": { "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 7.6, "baseSeverity": "HIGH", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-639", "description": "CWE-639 Authorization Bypass Through User-Controlled Key", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-24T21:04:08.766Z" }, "references": [ { "tags": [ "vendor-advisory", "related" ], "url": "https://github.com/elixir-grpc/grpc/security/advisories/GHSA-mwr4-5g34-j5cq" }, { "name": "EEF CNA record for CVE-2026-48599", "tags": [ "related" ], "url": "https://cna.erlef.org/cves/CVE-2026-48599.html" }, { "name": "OSV record EEF-CVE-2026-48599", "tags": [ "related" ], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-48599" }, { "name": "Introducing commit 8aaf3d3 in elixir-grpc/grpc", "tags": [ "related" ], "url": "https://github.com/elixir-grpc/grpc/commit/8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048" }, { "name": "Fix commit 33b6a09 in elixir-grpc/grpc", "tags": [ "patch" ], "url": "https://github.com/elixir-grpc/grpc/commit/33b6a095dbc91c6dee3c7b90893d7d74952e82e4" } ], "source": { "discovery": "EXTERNAL" }, "title": "Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding" }, "adp": [ { "references": [ { "url": "https://github.com/elixir-grpc/grpc/security/advisories/GHSA-mwr4-5g34-j5cq", "tags": [ "exploit" ] } ], "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-16T14:45:46.288762Z", "id": "CVE-2026-48599", "options": [ { "Exploitation": "poc" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T14:46:09.673Z" } } ] } }