{"id":"CVE-2026-48599","revision":null,"records":[{"revision":"f68fa6586d634cc6902f013d9ab37354","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-48599","aliases":[],"title":"Authorization bypass via path binding override in elixir-grpc/grpc HTTP transcoding","description":"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.","state":0,"publishedAt":"2026-06-15T21:55:28.702+00:00","modifiedAt":"2026-09-24T21:04:08.766+00:00","affected":[{"ecosystem":"https://repo.hex.pm","name":"grpc","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://repo.hex.pm\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.GRPC.Server.Transcode'\"\n                    ],\n                    \"packageName\": \"grpc\",\n                    \"packageURL\": \"pkg:hex/grpc\",\n                    \"product\": \"grpc\",\n                    \"programFiles\": [\n                        \"lib/grpc/server/transcode.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.GRPC.Server.Transcode':map_request/5\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/elixir-grpc/grpc\",\n                    \"vendor\": \"elixir-grpc\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"1.0.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"0.8.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"elixir-grpc/grpc","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:elixir-grpc:grpc:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.GRPC.Server.Transcode'\"\n                    ],\n                    \"packageName\": \"elixir-grpc/grpc\",\n                    \"packageURL\": \"pkg:github/elixir-grpc/grpc\",\n                    \"product\": \"grpc\",\n                    \"programFiles\": [\n                        \"lib/grpc/server/transcode.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.GRPC.Server.Transcode':map_request/5\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/elixir-grpc/grpc\",\n                    \"vendor\": \"elixir-grpc\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"33b6a095dbc91c6dee3c7b90893d7d74952e82e4\",\n                            \"status\": \"affected\",\n                            \"version\": \"8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":7.6,"severity":"HIGH"}],"references":["https://github.com/elixir-grpc/grpc/security/advisories/GHSA-mwr4-5g34-j5cq","https://cna.erlef.org/cves/CVE-2026-48599.html","https://osv.dev/vulnerability/EEF-CVE-2026-48599","https://github.com/elixir-grpc/grpc/commit/8aaf3d3a8c4c7b08ac65e9c6f254e0d24da1d048","https://github.com/elixir-grpc/grpc/commit/33b6a095dbc91c6dee3c7b90893d7d74952e82e4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-48599","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-48599","identifiers":["CVE-2026-48599"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-0580dcc98aaa46a8935f8ff576f25037","complete":true,"records":13764,"lastAttemptAt":"2026-11-12T11:56:20.2141865+00:00","lastSuccessAt":"2026-11-12T11:56:20.209+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:56:20.209+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13817,"expectedIdentifiers":13817,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-12T11:55:28.1860721+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-12T11:55:28.1860721+00:00","lastSuccessAt":"2026-11-12T11:55:28.4142299+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:55:28.4142304+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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