Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable service, no auth and no interaction due to the hard-coded secret (PR:N/UI:N/AC:L), and a root shell yields full C/I/A on the host; scope unchanged as the impact stays within the compromised system.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
CyberPanel before 3.0.0 contains a hard-coded JWT secret vulnerability in the WebTerminal FastAPI SSH service that allows unauthenticated remote attackers to forge valid authentication tokens and obtain an interactive root shell via WebSocket on port 8888. Attackers can craft a forged JWT signed with the hardcoded secret value, specifying ssh_user=root, to authenticate to the terminal service without any valid credentials and receive a root shell.
AnalysisAI
Unauthenticated remote root compromise affects CyberPanel before 3.0.0 through a hard-coded JWT signing secret in the WebTerminal FastAPI SSH service. Because the secret is baked into the code, an attacker can mint a valid token specifying ssh_user=root and connect to the WebSocket terminal on TCP 8888 with no credentials, receiving a fully interactive root shell. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The only prerequisite is network reachability of the CyberPanel WebTerminal FastAPI SSH service on TCP port 8888 in a version before 3.0.0; exploitation uses a JWT forged with the application's hard-coded signing secret and the claim ssh_user=root, requiring no valid account, no user interaction, and no prior foothold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This should be treated as a top-priority, drop-everything issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans the internet for CyberPanel hosts with TCP 8888 open, then uses the publicly known hard-coded JWT secret to sign a token containing ssh_user=root. They open a WebSocket to the WebTerminal service, present the forged token, and are dropped into an interactive root shell with no credentials required - from which they exfiltrate data, deploy malware, or pivot to every website the panel manages. … |
| Remediation | Upgrade to CyberPanel 3.0.0 or later, which is the fixed release per the vendor change log (https://cyberpanel.net/KnowledgeBase/home/change-logs/); this is the primary and authoritative fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all CyberPanel installations to identify systems running versions prior to 3.0.0 and immediately restrict network access to port 8888 (WebTerminal service) to administratively-controlled networks only; evaluate disabling WebTerminal entirely if SSH terminal access is not operationally required. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-58129
GHSA-jr78-52g9-xcm6