CVE-2026-49446
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.
- CVSS 3.1
- 6.1
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-25)
- CWEs
- CWE-285, CWE-290
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-2rx5-2g7j-2659 | Go | github.com/azukaar/cosmos-server | <0.22.19 | 0.22.19 |
| GO-2026-6123 | Go | github.com/azukaar/cosmos-server | <0.22.19 | 0.22.19 |
References
- https://github.com/azukaar/Cosmos-Server/commit/59c561d686c8f9843b3e092b50f6346c481d8bbf
- https://github.com/azukaar/Cosmos-Server/releases/tag/v0.22.19
- https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659
- https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-2rx5-2g7j-2659