{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49446","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-05-30T02:43:33.106Z","datePublished":"2026-09-15T14:31:24.778Z","dateUpdated":"2026-09-15T14:50:54.216Z"},"containers":{"cna":{"title":"Cosmos: Authentication bypass via forward-auth header smuggling on Constellation tunnel in Cosmos-Server","problemTypes":[{"descriptions":[{"cweId":"CWE-285","lang":"en","description":"CWE-285: Improper Authorization","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659","tags":["x_refsource_CONFIRM"],"url":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659"},{"name":"https://github.com/azukaar/Cosmos-Server/commit/59c561d686c8f9843b3e092b50f6346c481d8bbf","tags":["x_refsource_MISC"],"url":"https://github.com/azukaar/Cosmos-Server/commit/59c561d686c8f9843b3e092b50f6346c481d8bbf"},{"name":"https://github.com/azukaar/Cosmos-Server/releases/tag/v0.22.19","tags":["x_refsource_MISC"],"url":"https://github.com/azukaar/Cosmos-Server/releases/tag/v0.22.19"}],"affected":[{"vendor":"azukaar","product":"Cosmos-Server","versions":[{"version":"< 0.22.19","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-15T14:31:24.778Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-2rx5-2g7j-2659","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T14:50:32.130417Z","id":"CVE-2026-49446","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":"2026-09-15T14:50:54.216Z"}}]}}