CVE-2026-16876 NEC Corporation CVE debrief

Who should care

Defenders of UNIVERGE IX-R/IX-V systems should verify and apply vendor remediation for authentication bypass vulnerability. They should also restrict access to WebGUI to prevent tampering and monitor for suspicious activity. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-16876 authentication bypass vulnerability in UNIVERGE IX-R/IX-V WebGUI requires verification and remediation to prevent arbitrary CLI command execution.

• Verify authentication mechanisms for WebGUI
• Restrict access to WebGUI to prevent tampering
• Monitor for suspicious activity

Technical summary

CVE-2026-16876 is an authentication bypass vulnerability in UNIVERGE IX-R/IX-V WebGUI. A user could bypass authentication and execute arbitrary CLI commands by tampering with WebGUI messages and sending them to the device via internet. The vulnerability exists due to improper validation of user input. Defenders should verify the affected scope and review official advisory or CVE record.

Defensive priority

Verify and apply vendor remediation for authentication bypass vulnerability in UNIVERGE IX-R/IX-V WebGUI.

Recommended defensive actions

• Verify and apply vendor remediation for authentication bypass vulnerability in UNIVERGE IX-R/IX-V WebGUI.
• Restrict access to WebGUI to prevent tampering.
• Monitor for suspicious activity.
• 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.

Evidence notes

CVE-2026-16876 details from NVD indicate authentication bypass vulnerability in UNIVERGE IX-R/IX-V WebGUI, allowing arbitrary CLI command execution. The vulnerability exists due to improper validation of user input. A user could bypass authentication and execute arbitrary CLI commands by tampering with WebGUI messages and sending them to the device via internet. Defenders should verify the affected scope, review official advisory or CVE record, and plan vendor-supported updates or mitigations.

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.