FKIE_CVE-2026-41896

Vulnerability from fkie_nvd - Published: 2026-06-29 21:16 - Updated: 2026-06-30 14:14
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "coolify",
          "vendor": "coollabsio",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.0.0-beta.474"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s manual_webhook_secret_github field, which is used by Coolify\u0027s webhook endpoints to validate incoming requests, is nullable with no default \u2014 meaning newly created applications have a null webhook secret. PHP\u0027s hash_hmac() function silently coerces a null key to an empty string \u0027\u0027. So when the secret is null, the server computes hash_hmac(\u0027sha256\u0027, $payload, \u0027\u0027) \u2014 a deterministic value that any attacker can calculate independently. By sending X-Hub-Signature-256: sha256=\u003chash_hmac(\u0027sha256\u0027, payload, \u0027\u0027)\u003e, an unauthenticated attacker can forge a valid signature and trigger deployments. This vulnerability is fixed in 4.0.0-beta.474."
    }
  ],
  "id": "CVE-2026-41896",
  "lastModified": "2026-06-30T14:14:35.520",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-41896",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-30T12:55:46.494918Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-29T21:16:44.280",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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