CVE-2026-75122 PLANET Technology Corp. CVE debrief

Who should care

Network administrators and security teams responsible for managing PLANET GS-4210-16P2S V3 devices should assess exposure and prioritize remediation due to the high severity of this vulnerability.

Why it matters

CVE-2026-75122 is a high-severity authenticated OS command injection vulnerability in PLANET GS-4210-16P2S V3 firmware. Network administrators and security teams should assess exposure and prioritize remediation to prevent remote code execution and potential lateral movement within the network.

• Remote code execution with administrator web credentials
• Potential for lateral movement within the network
• Data tampering or unauthorized access to sensitive information
• Disruption of network operations

Technical summary

The vulnerability exists in the /cgi-bin/httpuploadcert.cgi script, where the certificate password field in a certificate upload request is incorporated into a shell command without sanitization of shell metacharacters. A remote attacker with administrator web credentials can submit a crafted certificate upload request to execute arbitrary operating-system commands on the device. This vulnerability affects PLANET GS-4210-16P2S V3 devices running firmware versions before 3.441b260626. Network administrators and security teams should assess exposure and prioritize remediation to prevent remote code execution and potential lateral movement within the network.

Defensive priority

High priority for network administrators and security teams responsible for managing PLANET GS-4210-16P2S V3 devices, as an attacker with administrator web credentials can exploit this vulnerability to execute arbitrary operating-system commands.

Recommended defensive actions

• Update PLANET GS-4210-16P2S V3 firmware to version 3.441b260626 or later
• Restrict access to the /cgi-bin/httpuploadcert.cgi script
• Monitor device logs for suspicious activity
• Verify administrator web credentials are secure
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD vulnerability detail provide information on the vulnerability, but the exact scope of affected versions and devices is limited. The vendor's security advisory and VulnCheck's advisory provide additional context, but further verification is needed to determine the full extent of the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.