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CVE-2026-67614 – Unauthenticated Root RCE via Hard-coded JWT Secret – CyberPanel before 3.0.0

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Summary

CVE-2026-67614 is a critical use-of-hard-coded-credentials vulnerability (CWE-798) in CyberPanel’s WebTerminal FastAPI SSH service. All CyberPanel versions before 3.0.0 use a hard-coded JWT signing secret, allowing an unauthenticated remote attacker to forge a valid authentication token and obtain an interactive root shell on the underlying server. The flaw carries a CVSS score of 9.3 and requires no user interaction or privileges to exploit.

Technical details

  • Root cause: The WebTerminal FastAPI SSH service embeds a static, hard-coded secret used to sign and verify JSON Web Tokens (JWTs).
  • Trigger conditions: An attacker crafts a JWT using the known hard-coded secret, sets the ssh_user=root claim, and presents it when connecting.
  • Attack vector: Network — the forged token is used to authenticate over a WebSocket connection to the WebTerminal service on port 8888.
  • Impact: Full compromise of confidentiality, integrity, and availability, since successful exploitation grants an interactive root shell on the host without any valid credentials.

Affected software

  • CyberPanel (usmannasir/cyberpanel) — all versions prior to 3.0.0

Severity

  • CVSS v3.1: 9.8 — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0: 9.3 — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade CyberPanel to version 3.0.0 or later, which removes the hard-coded JWT secret.
  • If patching is not immediately possible: Restrict network access to port 8888 (WebTerminal) to trusted management networks or VPNs only, and disable the WebTerminal/SSH service if it is not in active use until the upgrade can be applied.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: Login - CyberPanel
  • Named meta tag (description): Login to your CyberPanel Account

References

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How IONIX’s External Exposure Management Platform Detects and Validates
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1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

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By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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