CVE Intelligence

CIENA vulnerabilities

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Published CVEs affecting CIENA products: 4 record(s), with severity, exploitation and fixes.

Exploited only (KEV) →

CVE-2026-5267 High · 7.5 CWE-306 Sep 25, 2026
Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS
Ciena Navigator Network Control Suite (NCS) contains an information exposure vulnerability in an event-streaming API that does not properly enforce authentication. An unauthenticated attacker with network access to the affected service could access the event stream and potentially obtain sensitive information.
CVE-2026-5270 Critical · 9.8 CWE-287 Jul 14, 2026
Authentication Bypass in Navigator and Blue Planet Products
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.
CVE-2026-5269 Critical · 9.8 CWE-1393 Jul 14, 2026
Navigator NCS and MCP System Accounts with Default Passwords
In Ciena's Navigator Network Control Suite (NCS) and Manage Control Plan (MCP), there are hidden system accounts used for internal software operations. Some of these accounts have default passwords that may be predictable. While these accounts have very limited permissions on their own, an attacker could combine an attack using one of these accounts with other potential weaknesses to launch a more significant attack, possibly leading to escalation of privilege on the system.
CVE-2026-5268 Critical · 9.1 CWE-288 Jul 6, 2026
SFTP Server Authentication Weakness
An authentication bypass vulnerability exists in the default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could allow an attacker to read or modify system files.