{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.22.19"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "59c561d686c8f9843b3e092b50f6346c481d8bbf"
            }
          ],
          "repo": "https://github.com/azukaar/cosmos-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2rx5-2g7j-2659"
  ],
  "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"
  },
  "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.",
  "id": "CVE-2026-49446",
  "modified": "2026-09-17T03:30:50.929394769Z",
  "published": "2026-09-15T14:31:24.778Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Cosmos: Authentication bypass via forward-auth header smuggling on Constellation tunnel in Cosmos-Server"
}