# CVE-2026-49446

## Summary

- **CVE ID:** CVE-2026-49446
- **Severity:** MEDIUM
- **CVSS Score:** 6.1 (CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-285, CWE-290
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

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 Products

- azukaar — Cosmos-Server (< 0.22.19)

## References

- [CNA](https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659)
- [CNA](https://github.com/azukaar/Cosmos-Server/commit/59c561d686c8f9843b3e092b50f6346c481d8bbf)
- [CNA](https://github.com/azukaar/Cosmos-Server/releases/tag/v0.22.19)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.1

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._