Vulnerability-Lookup

CVE-2026-41896 (GCVE-0-2026-41896)

Vulnerability from cvelistv5 – Published: 2026-06-29 20:16 – Updated: 2026-06-30 12:55

Title

Coolify: Unauthenticated Deployment Trigger via Webhook HMAC Bypass with Null Secret

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-30 12:55 UTC

CWE

CWE-287 - Improper Authentication

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/coollabsio/coolify/security/ad…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
coollabsio	coolify	Affected: < 4.0.0-beta.474	guessed

Show details on NVD website

JSON

To clipboard

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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

References

	URL	Tags
	security-advisories@github.com	https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/coollabsio/coolify/security/advisories/GHSA-w8wm-r924-f65v

Impacted products

	Vendor	Product	Version

JSON

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."
    }
  ],
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  "lastModified": "2026-06-30T14:14:35.520",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.