Is CVE-2026-75121 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-75121 being exploited in the wild.

How severe is CVE-2026-75121?

High severity, with a CVSS score of 7.2, published 28 August 2026.

Which products and versions are affected?

PLANET GS-4210-16P2S V3 before 3.441b260626.

Is there a fix for CVE-2026-75121?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-75121 attacked?

It is attacked over the network.

Am I affected by CVE-2026-75121?

Check whether you run PLANET GS-4210-16P2S V3 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-75121: PLANET GS-4210-16P2S V3 OS command injection in dispatcher.cgi

CVE-2026-75121 · Severity: high · CVSS 7.2 · Published 2026-08-28

The PLANET GS-4210-16P2S V3 is a managed gigabit network switch used in corporate environments. An authenticated administrator can inject arbitrary operating system commands through the web management interface, gaining full control over the device. This allows an attacker with management credentials to compromise network infrastructure, manipulate network traffic, or cause service outages.

Technologies: PLANET GS-4210-16P2S V3. Vendors: PLANET.

Quick answers

Is CVE-2026-75121 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-75121 being exploited in the wild.
How severe is CVE-2026-75121?: High severity, with a CVSS score of 7.2, published 28 August 2026.
Which products and versions are affected?: PLANET GS-4210-16P2S V3 before 3.441b260626.
Is there a fix for CVE-2026-75121?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-75121 attacked?: It is attacked over the network.
Am I affected by CVE-2026-75121?: Check whether you run PLANET GS-4210-16P2S V3 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

OS command injection (CWE-78) in the web_vlan_membership_edit_dialog_post handler of /cgi-bin/dispatcher.cgi. The memberTags POST parameter is directly concatenated into a shell command without sanitization of metacharacters, allowing injection of arbitrary commands. The vulnerability requires authentication with administrator-level web-management privileges; an attacker must provide valid credentials to reach the vulnerable endpoint. Successful exploitation grants command execution with the privileges of the CGI process, enabling full device compromise. Firmware version 3.441b260626 and later contain the fix.

Affected products

PLANET GS-4210-16P2S V3 before 3.441b260626

Timeline

2026-08-28: disclosed

References

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