{"id":"CVE-2026-49446","summary":"Cosmos: Authentication bypass via forward-auth header smuggling on Constellation tunnel in Cosmos-Server","details":"Cosmos provides users the ability self-host a home server by acting as a secure gateway to your application, as well as a server manager. Prior to 0.22.19, tokenMiddleware in src/proxy/routerGen.go can return through the Constellation tunnel bypass before removing x-cosmos-user, x-cosmos-role, x-cosmos-user-role, and x-cosmos-mfa headers and before invoking AdminOnlyWithRedirect. An attacker with a valid x-cstln-auth API key for an enrolled device who reaches Cosmos through the Constellation Nebula tunnel can supply a chosen x-cosmos-user value to a route with AuthEnabled enabled when the upstream application trusts that forward-auth header. The request can bypass Cosmos JWT, password, MFA, and AdminOnly checks, allowing user impersonation and admin-tier reads or writes exposed by the proxied application. This issue is fixed in version 0.22.19.","aliases":["GHSA-2rx5-2g7j-2659","GO-2026-6123"],"modified":"2026-09-17T03:46:01.440200721Z","published":"2026-09-15T14:31:24.778Z","related":["openSUSE-SU-2026:21761-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-285","CWE-290"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49446.json"},"references":[{"type":"WEB","url":"https://github.com/azukaar/Cosmos-Server/releases/tag/v0.22.19"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49446.json"},{"type":"ADVISORY","url":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49446"},{"type":"FIX","url":"https://github.com/azukaar/Cosmos-Server/commit/59c561d686c8f9843b3e092b50f6346c481d8bbf"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/azukaar/cosmos-server","events":[{"introduced":"0"},{"fixed":"59c561d686c8f9843b3e092b50f6346c481d8bbf"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"0.22.19"}]}}],"versions":["v0.22.18","v0.22.16","v0.22.15","v0.22.14","v0.22.13","v0.22.12","v0.22.11","v0.22.10","v0.22.9","v0.22.8","v0.22.7","v0.22.6","v0.22.5","v0.22.4","v0.22.3","v0.22.2","v0.22.1","v0.22.0","v0.22.0-unstable15","v0.22.0-unstable14","v0.22.0-unstable13","v0.22.0-unstable12","v0.22.0-unstable11","v0.22.0-unstable10","v0.22.0-unstable09","v0.22.0-unstable08","v0.22.0-unstable07","v0.22.0-unstable06","v0.22.0-unstable04","v0.22.0-unstable03","v0.22.0-unstable01","v0.21.7","v0.21.6","v0.21.5","v0.21.4","v0.21.3","v0.21.2","v0.21.1","v0.21.0","v0.21.0-unstable96","v0.21.0-unstable95","v0.21.0-unstable94","v0.21.0-unstable93","v0.21.0-unstable92","v0.21.0-unstable91","v0.21.0-unstable9","v0.21.0-unstable8","v0.21.0-unstable7","v0.21.0-unstable6","v0.21.0-unstable5","v0.21.0-unstable4","v0.21.0-unstable3","v0.21.0-unstable2","v0.20.2","v0.20.1","v0.20.1-unstable1","v0.20.0","v0.20.0-unstable5","v0.20.0-unstable4","v0.20.0-unstable3","v0.20.0-unstable2","v0.20.0-unstable1","v0.19.1","v0.19.0","v0.19.0-unstable92","v0.19.0-unstable91","v0.19.0-unstable9","v0.19.0-unstable8","v0.19.0-unstable7","v0.19.0-unstable6","v0.19.0-unstable4","v0.19.0-unstable3","v0.19.0-unstable2","v0.19.0-unstable10","v0.19.0-unstable1","v0.18.4","v0.18.3","v0.18.2","v0.18.1","v0.18.0","v0.18.0-unstable991","v0.18.0-unstable99","v0.18.0-unstable98","v0.18.0-unstable97","v0.18.0-unstable96","v0.18.0-unstable95","v0.18.0-unstable94","v0.18.0-unstable93","v0.18.0-unstable92","v0.18.0-unstable90","v0.18.0-unstable9","v0.18.0-unstable8","v0.18.0-unstable7","v0.18.0-unstable4","v0.18.0-unstable3","v0.18.0-unstable2","v0.18.0-unstable10","v0.18.0-unstable1","v0.17.7","v0.17.6","v0.17.5","v0.17.4","v0.17.3","v0.17.2","v0.17.1","v0.17.0","v0.17.0-unstable17","v0.17.0-unstable16","v0.17.0-unstable15","v0.17.0-unstable14","v0.17.0-unstable13","v0.17.0-unstable12","v0.17.0-unstable11","v0.17.0-unstable10","v0.17.0-unstable9","v0.17.0-unstable8","v0.17.0-unstable7","v0.17.0-unstable6","v0.17.0-unstable5","v0.17.0-unstable4","v0.17.0-unstable3","v0.17.0-unstable2","v0.17.0-unstable1","v0.17.0-unstable30","v0.17.0-unstable29","v0.17.0-unstable28","v0.17.0-unstable27","v0.17.0-unstable26","v0.17.0-unstable25","v0.17.0-unstable24","v0.17.0-unstable23","v0.17.0-unstable22","v0.17.0-unstable21","v0.17.0-unstable20","v0.17.0-unstable19","v0.17.0-unstable18","v0.16.3","v0.16.3-unstable2","v0.16.3-unstable1","v0.16.2","v0.16.1","v0.16.1-unstable2","v0.16.1-unstable1","v0.16.0","v0.16.0-unstable62","v0.16.0-unstable61","v0.16.0-unstable60","v0.16.0-unstable59","v0.16.0-unstable58","v0.16.0-unstable57","v0.16.0-unstable56","v0.16.0-unstable55","v0.16.0-unstable54","v0.16.0-unstable53","v0.16.0-unstable52","v0.16.0-unstable51","v0.16.0-unstable50","v0.16.0-unstable49","v0.16.0-unstable48","v0.16.0-unstable47","v0.16.0-unstable46","v0.16.0-unstable45","v0.16.0-unstable44","v0.16.0-unstable43","v0.16.0-unstable42","v0.16.0-unstable41","v0.16.0-unstable40","v0.16.0-unstable39","v0.16.0-unstable38","v0.16.0-unstable37","v0.16.0-unstable36","v0.16.0-unstable35","v0.16.0-unstable34","v0.16.0-unstable33","v0.16.0-unstable32","v0.16.0-unstable31","v0.16.0-unstable30","v0.16.0-unstable29","v0.16.0-unstable28","v0.16.0-unstable27","v0.16.0-unstable26","v0.16.0-unstable25","v0.16.0-unstable24","v0.16.0-unstable23","v0.16.0-unstable22","v0.16.0-unstable21","v0.16.0-unstable20","v0.16.0-unstable19","v0.16.0-unstable18","v0.16.0-unstable17","v0.16.0-unstable16","v0.16.0-unstable15","v0.16.0-unstable14","v0.16.0-unstable13","v0.16.0-unstable12","v0.16.0-unstable11","v0.16.0-unstable10","v0.16.0-unstable9","v0.16.0-unstable8","v0.16.0-unstable7","v0.16.0-unstable6","v0.16.0-unstable5","v0.16.0-unstable4","v0.16.0-unstable3","v0.16.0-unstable2","v0.15.7","v0.15.7-unstable3","v0.15.7-unstable2","v0.15.7-unstable1","v0.1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ve-osv-conversion/osv-output/CVE-2026-49446.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N"}]}