CVE-2026-75121 PLANET GS-4210-16P2S V3 Command Injection via dispatcher.cgi web_vlan_membership_edit_dialog_post
Remote authenticated attackers can execute arbitrary OS commands on PLANET GS-4210-16P2S V3 switches via unsanitized input in the VLAN membership handler.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75121?
CVE-2026-75121 is a high-severity command injection vulnerability in PLANET GS-4210-16P2S V3, published on 28 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-75121?
How do I fix CVE-2026-75121?
No fix has been published for CVE-2026-75121 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-75121 being exploited?
There is no known exploitation of CVE-2026-75121 in the wild and no public exploit code.
Sources
Also known as GHSA-68x8-vj3q-q9cg.