---
id: CVE-2026-75121
title: >-
  PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains an authenticated
  OS command injection vulnerability in /cgi-bin/dispatcher.cgi
summary: >-
  PLANET GS-4210-16P2S V3 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 int…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:20:22.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75121'
references:
  - url: 'https://www.planet.com.tw/en/support/security-advisory/10'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/planet-gs-4210-16p2s-command-injection-via-dispatcher-cgi-web-vlan-membership-edit-dialog-post
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.01148
epssPercentile: 0.65438
ingestedAt: '2026-09-08T21:11:12.287Z'
---

## Overview

PLANET GS-4210-16P2S V3 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.