{"id":"CVE-2026-49446","sourceIdentifier":"security-advisories@github.com","published":"2026-09-15T15:17:16.747","lastModified":"2026-09-30T17:51:56.193","vulnStatus":"Deferred","cveTags":[],"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"azukaar","product":"Cosmos-Server","versions":[{"version":"< 0.22.19","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","baseScore":6.1,"baseSeverity":"MEDIUM","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":0.9,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-15T14:50:32.130417Z","id":"CVE-2026-49446","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-285"},{"lang":"en","value":"CWE-290"}]}],"references":[{"url":"https://github.com/azukaar/Cosmos-Server/commit/59c561d686c8f9843b3e092b50f6346c481d8bbf","source":"security-advisories@github.com"},{"url":"https://github.com/azukaar/Cosmos-Server/releases/tag/v0.22.19","source":"security-advisories@github.com"},{"url":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659","source":"security-advisories@github.com"},{"url":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}