Coolify: Unauthenticated Deployment Trigger via Webhook HMAC Bypass with Null Secret_CVE-2026-41896

{
    "lastseen": "",
    "description": "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 \u2014 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, '') \u2014 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.",
    "published": "2026-06-29T20:16:50.951Z",
    "modified": "2026-06-29T20:16:50.951Z",
    "type": "cve",
    "title": "Coolify: Unauthenticated Deployment Trigger via Webhook HMAC Bypass with Null Secret",
    "source": "GitHub_M",
    "references": "https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v",
    "id": "CVE-2026-41896",
    "bulletinFamily": "",
    "cwe": [
        "CWE-287"
    ],
    "cvelist": null,
    "sourceData": "coollabsio coolify < 4.0.0-beta.474",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "coolify",
    "version": "< 4.0.0-beta.474",
    "vendor": "coollabsio",
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    "ai_score": 0
}