CVE-2026-5270criticalCWE-287

CVE-2026-5270: critical vulnerability in CIENA MCP

Authentication Bypass in Navigator and Blue Planet Products

Published · Updated

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 0.7%
An authentication bypass vulnerability exists in certain releases of Ciena Navigator Network Control Suite (NCS), Manage Control Plan (MCP), and Blue Planet products. The issue is caused by improper handling of HTTP request paths and headers, which allows an unauthenticated attacker to manipulate requests in a manner that bypasses authentication and associated audit logging controls.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Blue Planet · InventoryBlue Planet · OrchestrationBlue Planet · Route Optimization & AnalysisBlue Planet · Unified Assurance & AnalyticsCIENA · MCPCIENA · Navigator NCSCIENA · Planner Plus OnPrem