VulnerabilityAwaiting Analysis

CVE-2026-5270

An authentication bypass vulnerability exists in certain releases of Ciena Navigator Network Control Suite (NCS), Manage Control Plan (MCP), and Blue Planet products.

CRITICAL 9.8EPSS 0.66%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.66%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

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: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.66% probability · 50th percentile
CISA KEV: Not listed
Weakness: CWE-287
Source: 7bd90cf1-1651-495e-9ae8-9415fb3c9feb

References

https://www.ciena.com/product-security

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.