What is CVE-2026-27956?

CVE-2026-27956 is a medium-severity vulnerability in Coollabsio Coolify, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-06-30.

How severe is CVE-2026-27956?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Coollabsio Coolify

CVE-2026-27956

Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.464, `GET /api/v1/servers/{server_uuid}/domains?uuid={app_uuid}` bypasses team scoping when the optional uuid query parameter is provided. Any authenticated API user can enumerate domain names (FQDNs) of applications belonging to other teams. This vulnerability is fixed in 4.0.0-beta.464.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.002 (7.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Coollabsio Coolify — versions < 4.0.0-beta.464

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-27956?: CVE-2026-27956 is a medium-severity vulnerability in Coollabsio Coolify, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-06-30.
How severe is CVE-2026-27956?: Medium severity. CVSS v3 base score is 4.3 out of 10.