CVE-2026-41896

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 86% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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=, 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
EG Score
7.5(medium)
EPSS
13.9%
KEV
Not listed

Published

June 29, 2026

Last Modified

June 30, 2026

Advisory Details (1)

Auto-updated Jun 29, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Unauthenticated Deployment Trigger via Webhook HMAC Bypass with Null Secret · Advisory · coollabsio/coolify · GitHub

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 13:18 UTCEG score recompute
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-15 00:47 UTCEG score recompute
  4. 2026-07-14 12:15 UTCEG score recompute
  5. 2026-07-13 23:44 UTCEG score recompute
  6. 2026-07-13 22:30 UTCEPSS rescore
  7. 2026-07-13 11:13 UTCEG score recompute
  8. 2026-07-13 06:13 UTCEPSS rescore
  9. 2026-07-13 06:13 UTCEPSS rescore
  10. 2026-07-12 22:42 UTCEG score recompute
  11. 2026-07-12 10:10 UTCEG score recompute
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-11 21:38 UTCEG score recompute
  14. 2026-07-11 09:06 UTCEG score recompute
  15. 2026-07-11 08:27 UTCEPSS rescore
  16. 2026-07-10 20:35 UTCEG score recompute
  17. 2026-07-10 08:01 UTCEG score recompute
  18. 2026-07-09 19:29 UTCEG score recompute
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-09 06:57 UTCEG score recompute
  21. 2026-07-08 18:25 UTCEG score recompute
  22. 2026-07-08 15:15 UTCEPSS rescore
  23. 2026-07-08 05:54 UTCEG score recompute
  24. 2026-07-07 17:16 UTCEG score recompute
  25. 2026-07-07 13:46 UTCEPSS rescore
Show 24 more
  1. 2026-07-07 04:41 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:05 UTCEG score recompute
  5. 2026-07-06 03:30 UTCEG score recompute
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-05 14:53 UTCEG score recompute
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-05 02:20 UTCEG score recompute
  11. 2026-07-04 13:49 UTCEG score recompute
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-04 01:17 UTCEG score recompute
  14. 2026-07-03 12:45 UTCEG score recompute
  15. 2026-07-03 00:11 UTCEG score recompute
  16. 2026-07-02 11:40 UTCEG score recompute
  17. 2026-07-01 23:05 UTCEG score recompute
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-07-01 10:32 UTCEG score recompute
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 21:59 UTCEG score recompute
  22. 2026-06-30 09:28 UTCEG score recompute
  23. 2026-06-29 20:57 UTCEG score recompute
  24. 2026-06-29 20:57 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-41896?
CVE-2026-41896 is a high vulnerability published on June 29, 2026. 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 manualwebhooksecretgithub field, which is used by Coolify's webhook endpoints to validate incoming requests, is nullable with no default —…
When was CVE-2026-41896 disclosed?
CVE-2026-41896 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41896 actively exploited?
CVE-2026-41896 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41896?
CVE-2026-41896 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-41896?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41896, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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