CVE-2026-41896

Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.474, the HMAC key is the application's manual_webhook_secret_github field, which is used by Coolify's webhook endpoints to validate incoming requests, is nullable with no default — meaning newly created applications have a null webhook secret. PHP's hash_hmac() function silently coerces a null key to an empty string ''. So when the secret is null, the server computes hash_hmac('sha256', $payload, '') — a deterministic value that any attacker can calculate independently. By sending X-Hub-Signature-256: sha256=<hash_hmac('sha256', payload, '')>, an unauthenticated attacker can forge a valid signature and trigger deployments. This vulnerability is fixed in 4.0.0-beta.474.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v
https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v

Configurations

No configuration.

History

No history.

Information

Published : 2026-06-29 21:16

Updated : 2026-06-30 14:14

NVD link : CVE-2026-41896

Mitre link : CVE-2026-41896

CVE.ORG link : CVE-2026-41896

JSON object : View

Products Affected

No product.

CWE

CWE-287

Improper Authentication

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