{"id":"CVE-2026-49446","title":"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","summary":"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 tu…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-285","CWE-290"],"vendor":"azukaar","product":"Cosmos-Server","affected":["Cosmos-Server < 0.22.19"],"patched":["github.com/azukaar/cosmos-server 0.22.19"],"published":"2026-09-15","updated":"2026-09-15","sourceUpdated":"2026-09-15T15:17:16.747","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49446","references":[{"url":"https://github.com/azukaar/Cosmos-Server/commit/59c561d686c8f9843b3e092b50f6346c481d8bbf","label":"security-advisories@github.com"},{"url":"https://github.com/azukaar/Cosmos-Server/releases/tag/v0.22.19","label":"security-advisories@github.com"},{"url":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659","label":"security-advisories@github.com"},{"url":"https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-2rx5-2g7j-2659"}],"tags":["nvd","cve.org","exploit-available","ghsa","go"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-15T14:50:32.130417Z"},"aliases":["GHSA-2rx5-2g7j-2659"],"ecosystem":"go","ingestedAt":"2026-07-28T21:39:18.398Z","epss":0.00285,"epssPercentile":0.21199,"slug":"CVE-2026-49446","body":"## Overview\n\nCosmos 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-49446)\n\nAffected packages:\n\n- `github.com/azukaar/cosmos-server <= 0.22.18`\n\nPatched in:\n\n- `github.com/azukaar/cosmos-server 0.22.19`\n\nSource: https://github.com/advisories/GHSA-2rx5-2g7j-2659","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":203804,"id":"CVE-2026-49446","ts":1789486793656,"field":"exploit_available","old":"false","new":"true"}]}