CVE-2026-75121Network attack vector

Authenticated command execution via unsanitized memberTags parameter

Published Aug 28, 2026 · Updated Aug 28, 2026

OS command injection in PLANET GS-4210-16P2S firmware before 3.441b260626 allows remote authenticated users to execute arbitrary commands. The /cgi-bin/dispatcher.cgi web_vlan_membership_edit_dialog_post handler inserts the memberTags POST value into a shell command without sanitization. Administrator-level web-management access is required, after which injected commands run on the switch and can read, alter, or interrupt device operations.

CVSS severity8.6
High
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in PLANET GS-4210-16P2S firmware before 3.441b260626 allows remote authenticated users to execute arbitrary commands. The /cgi-bin/dispatcher.cgi web_vlan_membership_edit_dialog_post handler inserts the memberTags POST value into a shell command without sanitization. Administrator-level web-management access is required, after which injected commands run on the switch and can read, alter, or interrupt device operations.

The record

CVE
CVE-2026-75121
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
PLANET Technology Corporation
Product
PLANET GS-4210-16P2S
Classifications
CWE-78, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.441b260626

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

PLANET Technology Corporation · PLANET GS-4210-16P2Sversion=0 <3.441b260626

Published CVSS scores

7.2PLANET Technology CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.6PLANET Technology CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo