CVE-2026-49447 Cosmos-Server's constellation public-devices endpoint accepts arbitrary bearer tokens
Attackers can access Constellation device metadata by providing any non-empty bearer token, bypassing authentication checks in Cosmos-Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49447?
CVE-2026-49447 is a medium-severity authentication bypass vulnerability in azukaar Cosmos-Server, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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. In 0.22.18, `GET /cosmos/api/constellation/public-devices` discloses Constellation device metadata to a requester that supplies any non-empty Authorization header. The handler strips the string Bearer from the header but never validates the resulting token and never uses it in the database query. This vulnerability is fixed in 0.22.19.
Weakness: CWE-287
Which versions are affected by CVE-2026-49447?
3 open source packages ship an affected version, including github.com/azukaar/cosmos-server.
| Package | Affected | Fixed in |
|---|---|---|
github.com/azukaar/cosmos-server Go | From 0.22.18 | 0.22.19 |
github.com/azukaar/cosmos-server Go | From 0.22.18 | 0.22.19 |
github.com/azukaar/cosmos-server Go | From 0.22.18 | 0.22.19 |
How do I fix CVE-2026-49447?
Upgrade github.com/azukaar/cosmos-server to 0.22.19 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-49447 being exploited?
There is no known exploitation of CVE-2026-49447 in the wild and no public exploit code.
Sources
Also known as GHSA-5fqm-cc34-fcf5, GO-2026-6124.