{
    "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": "2026-06-17T04:46:32.876Z"
    },
    "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."
                        }
                    ],
                    "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
                                }
                            ],
                            "operator": "OR"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Peter Ullrich"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Paulo Valente"
                },
                {
                    "lang": "en",
                    "type": "analyst",
                    "value": "Jonatan Männchen"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>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.</p><p>In <tt>'Elixir.GRPC.Server.Transcode':map_request/5</tt> (<tt>lib/grpc/server/transcode.ex</tt>), all three clauses use <tt>Map.merge/2</tt> with path bindings as the first argument, giving them the lowest merge precedence. A request such as <tt>GET /users/me/profile?user_id=victim</tt> (or a POST with <tt>{\"user_id\": \"victim\"}</tt> when <tt>body: \"*\"</tt>) 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.</p><p>This issue affects grpc from 0.8.0 before 1.0.0.</p>"
                        }
                    ],
                    "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": {
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "attackVector": "NETWORK",
                        "baseScore": 7.6,
                        "baseSeverity": "HIGH",
                        "privilegesRequired": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "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"
                    },
                    "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": "2026-06-17T04:46:32.876Z"
            },
            "references": [
                {
                    "tags": [
                        "vendor-advisory",
                        "related"
                    ],
                    "url": "https://github.com/elixir-grpc/grpc/security/advisories/GHSA-mwr4-5g34-j5cq"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://cna.erlef.org/cves/CVE-2026-48599.html"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://osv.dev/vulnerability/EEF-CVE-2026-48599"
                },
                {
                    "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",
            "x_generator": {
                "engine": "cvelib 1.8.0"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/elixir-grpc/grpc/security/advisories/GHSA-mwr4-5g34-j5cq",
                        "tags": [
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                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-16T14:45:46.288762Z",
                                "id": "CVE-2026-48599",
                                "options": [
                                    {
                                        "Exploitation": "poc"
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                                    {
                                        "Automatable": "no"
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                                        "Technical Impact": "total"
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                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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                    "dateUpdated": "2026-06-16T14:46:09.673Z"
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