CVE-2025-23214: Cosmos userbase checking vulnerability

Severity: medium (CVSS 6.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-20 · updated 2026-06-17
Weakness: CWE-204

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. By monitoring the error code returned in the login, it is possible to figure out whether a user exist or not in the database. Patched in 0.17.7.

Affected products

azukaar Cosmos-Server: before 0.17.7

References

https://github.com/azukaar/Cosmos-Server/commit/ef643b4882b0ec074f4021d52583c7c00eac4691
https://github.com/azukaar/Cosmos-Server/security/advisories/GHSA-5843-2p4f-57fh

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