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PLANET GS-4210-16P2S CVE-2026-75121

| EUVDEUVD-2026-67781 HIGH
OS Command Injection (CWE-78)
2026-08-28 VulnCheck GHSA-68x8-vj3q-q9cg
Command Injection Planet Gs 4210 16P2S
8.6
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
7.2 HIGH

Management interface is network-accessible (AV:N), no complexity beyond credentials (AC:L), admin authentication required (PR:H), full device impact with no scope change.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
High
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 28, 2026 - 20:20 vuln.today
CVE Published
Aug 28, 2026 - 15:29 cve.org
HIGH 8.6

DescriptionCVE.org

PLANET GS-4210-16P2S firmware before 3.441b260626 contains an authenticated OS command injection vulnerability in /cgi-bin/dispatcher.cgi. The web_vlan_membership_edit_dialog_post handler incorporates the memberTags POST parameter into a shell command without sanitization. A remote authenticated attacker can send a crafted memberTags value to execute arbitrary operating-system commands on the device.

AnalysisAI

OS command injection in the PLANET GS-4210-16P2S managed PoE switch firmware before 3.441b260626 allows an authenticated remote attacker with administrative access to execute arbitrary operating-system commands on the device. The VLAN membership editing handler in /cgi-bin/dispatcher.cgi passes the memberTags POST parameter directly into a shell command without any sanitization, constituting a textbook CWE-78 flaw. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires valid administrative (high-privilege) credentials to the GS-4210-16P2S web management interface, confirmed by CVSS PR:H. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) scores 8.6, reflecting high network reachability and full C/I/A impact, but critically constrained by PR:H - administrative credentials are required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade the PLANET GS-4210-16P2S firmware to version 3.441b260626 or later, as confirmed by the vendor security advisory at https://www.planet.com.tw/en/support/security-advisory/10. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all PLANET GS-4210-16P2S devices in your environment and document current firmware versions to determine exposure scope. …

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Same weakness CWE-78 – OS Command Injection

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CVE-2026-75121 vulnerability details – vuln.today
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