HMAC Key Vulnerability in Coolify by Coollabs
CVE-2026-41896

7.5HIGH

Key Information:

Vendor

Coollabsio

Status
Coolify
Vendor
CVE Published:
29 June 2026

What is CVE-2026-41896?

Coolify, an open-source self-hostable management tool, suffers from a vulnerability where its HMAC key, intended for webhook request validation, can be set to null. This oversight allows attackers to calculate a deterministic hash using PHP's hash_hmac() function. By exploiting this flaw, an unauthenticated attacker can forge valid webhook signatures to trigger unauthorized deployments. The issue has been addressed in version 4.0.0-beta.474.

Affected Version(s)

coolify < 4.0.0-beta.474

References

https://github.com/coollabsio/coolify/security/advisories...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.