CVE-2026-5267: CWE-306 Missing authentication for critical function in Ciena Navigator NCS
Ciena Navigator Network Control Suite (NCS) versions 8.0 through 10.0 contain an information exposure vulnerability due to missing authentication on a critical event-streaming API. This flaw allows an unauthenticated attacker with network access to the service to access sensitive event stream data. No CVSS score is available, and no patch information has been provided.
AI Analysis
Technical Summary
CVE-2026-5267 identifies a missing authentication vulnerability (CWE-306) in the event-streaming API of Ciena Navigator NCS. This vulnerability permits unauthenticated attackers on the network to access the event stream, potentially exposing sensitive information. The affected versions explicitly include 8.0, 8.1, 8.2, 9.0, 9.1, 9.2, and 10.0. There is no indication of known exploits in the wild or available patches at this time.
Potential Impact
An attacker with network access to the affected Ciena Navigator NCS service can obtain sensitive information from the event stream without authentication. This exposure could lead to information disclosure that may aid further attacks or compromise confidentiality of network operations data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to the event-streaming API to trusted users and networks only to reduce exposure.
CVE-2026-5267: CWE-306 Missing authentication for critical function in Ciena Navigator NCS
Description
Ciena Navigator Network Control Suite (NCS) versions 8.0 through 10.0 contain an information exposure vulnerability due to missing authentication on a critical event-streaming API. This flaw allows an unauthenticated attacker with network access to the service to access sensitive event stream data. No CVSS score is available, and no patch information has been provided.
Affected software
Ciena
Navigator NCS
pkg:github/ciena/navigator-ncsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-5267 identifies a missing authentication vulnerability (CWE-306) in the event-streaming API of Ciena Navigator NCS. This vulnerability permits unauthenticated attackers on the network to access the event stream, potentially exposing sensitive information. The affected versions explicitly include 8.0, 8.1, 8.2, 9.0, 9.1, 9.2, and 10.0. There is no indication of known exploits in the wild or available patches at this time.
Potential Impact
An attacker with network access to the affected Ciena Navigator NCS service can obtain sensitive information from the event stream without authentication. This exposure could lead to information disclosure that may aid further attacks or compromise confidentiality of network operations data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to the event-streaming API to trusted users and networks only to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Ciena
- Date Reserved
- 2026-03-31T19:44:26.584Z
- State
- PUBLISHED
Threat ID: 6ab6cc7cf7a7c54106319341
Added to database: 09/25/2026, 19:33:16 UTC
Last enriched: 09/25/2026, 19:47:39 UTC
Last updated: 09/25/2026, 19:47:39 UTC
Views: 5
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