CVE-2026-5267

Received Received - Intake

Information Exposure in Ciena Navigator Network Control Suite

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: Ciena

Description

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-25

Last Modified

2026-09-25

Generated

2026-09-26

AI Q&A

2026-09-26

EPSS Evaluated

N/A

NVD

CVE-2026-5267

Affected Vendors & Products

Vendor	Product	Version / Range
ciena	navigator_network_control_suite	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-306	The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

Executive Summary

CVE-2026-5267 is an information exposure vulnerability in Ciena Navigator Network Control Suite (NCS). It affects an event-streaming API that fails to enforce proper authentication. An unauthenticated attacker with network access to the service could exploit this to access the event stream and potentially obtain sensitive information.

Detection Guidance

To detect this vulnerability, check if the Ciena Navigator Network Control Suite's event-streaming API is exposed without authentication. Use network scanning tools like nmap to identify open ports and services. Example command: nmap -sV -p- <target_IP>. Inspect API endpoints for unauthenticated access to event streams.

Impact Analysis

This vulnerability could allow unauthorized access to sensitive data transmitted via the event-streaming API. Attackers might intercept confidential information, leading to data breaches, privacy violations, or further exploitation of exposed data.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR, HIPAA, or other regulations due to unauthorized data exposure. Organizations may face legal penalties, reputational damage, and loss of trust if sensitive data is compromised through this flaw.

Mitigation Strategies

Immediately restrict network access to the event-streaming API using firewalls or network segmentation. Enable authentication for the API if not already configured. Update to the latest patched version of Ciena NCS if available. Monitor logs for unauthorized access attempts.

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