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Coolify EUVDEUVD-2026-40333

| CVE-2026-27956 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-06-30 GitHub_M
Authentication Bypass Coolify
4.3
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
4.3 MEDIUM

Authenticated API access required (PR:L); discloses only domain names (C:L); no write or availability impact; scope unchanged within the application boundary.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Patch available
Jun 30, 2026 - 16:01 EUVD
Analysis Generated
Jun 30, 2026 - 15:22 vuln.today

DescriptionCVE.org

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.

AnalysisAI

{server_uuid}/domains endpoint silently drops team-scope enforcement when the optional uuid query parameter is supplied, producing a classic IDOR (CWE-639) condition where a user-controlled key bypasses authorization. No active exploitation is confirmed (not in CISA KEV) and no public exploit code has been identified, but the low attack complexity and single authentication prerequisite make the flaw trivially exploitable by any tenant in a multi-tenant Coolify deployment.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Coolify API with any valid credential
Delivery
Enumerate or guess server UUID via other API calls
Exploit
Iterate application UUIDs across teams
Execution
Issue GET /api/v1/servers/{server_uuid}/domains?uuid={target_app_uuid}
Impact
Harvest cross-team FQDNs for reconnaissance
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Vulnerability AssessmentAI

Exploitation Requires a valid Coolify API authentication credential belonging to any team on the instance (PR:L - at least low-privilege authenticated access is mandatory; unauthenticated exploitation is not possible per the CVSS PR:L rating). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD-assigned CVSS 3.1 score of 4.3 (Medium) with vector AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N is well-calibrated: the attack is network-reachable with low complexity and requires only a valid API credential (PR:L), but impact is limited strictly to confidentiality of domain names (C:L) with no integrity or availability consequence (I:N/A:N, S:U). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who holds valid API credentials on a shared Coolify instance - for example, a legitimate tenant or a user whose credentials were compromised - sends authenticated GET requests to /api/v1/servers/{known_server_uuid}/domains?uuid={target_app_uuid}, iterating or guessing application UUIDs. The server returns the FQDNs configured for that application without enforcing team membership, allowing the attacker to map the domain names and internal hostnames of applications belonging to other teams. …
Remediation Upgrade to Coolify 4.0.0-beta.464 or any later release; this version is confirmed by the vendor to contain the fix per GitHub Security Advisory GHSA-9x6p-29p3-h466 (https://github.com/coollabsio/coolify/security/advisories/GHSA-9x6p-29p3-h466). … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-40333 vulnerability details – vuln.today
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