Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS
Priority LOW 39CWE-306Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-306.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0036 30th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| CIENA | Navigator NCS | 7.2 and any older release; 7.2-P01 through 7.2-P07; 8.0; 8.0-P01 through 8.0-P06A; 8.1; 8.1-P01 through 8.1-P06; 8.2; 8.2-P01 through 8.2-P06; 9.0; 9.0-P01 through 9.0-P05A; 9.1; 9.1-P01 through 9.1-P05; 9.2; 9.2-P01 through 9.2-P02; 10.0; 10.0-P01 through 10.0-P01B | — | No fix listed | CNA |
- Navigator NCS VendorCIENA Affected 7.2 and any older release; 7.2-P01 through 7.2-P07; 8.0; 8.0-P01 through 8.0-P06A; 8.1; 8.1-P01 through 8.1-P06; 8.2; 8.2-P01 through 8.2-P06; 9.0; 9.0-P01 through 9.0-P05A; 9.1; 9.1-P01 through 9.1-P05; 9.2; 9.2-P01 through 9.2-P02; 10.0; 10.0-P01 through 10.0-P01B Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-5267
- 2026-10-03 Alias added: GHSA-6mqq-ppj3-rm94
References
More CIENA vulnerabilities
- TI-2026-04605 Authentication Bypass in Navigator and Blue Planet Products CVSS 3.1CRITICAL 9.8
- TI-2026-04604 Navigator NCS and MCP System Accounts with Default Passwords CVSS 3.1CRITICAL 9.8
- TI-2026-04603 SFTP Server Authentication Weakness CVSS 3.1CRITICAL 9.1
- TI-2024-01865 SAML implementation allows privilege escalation CVSS 3.1CRITICAL 9.0
Sources
- CVE-2026-5267 · CVE Program
- CVE-2026-5267 · NVD
- FIRST EPSS
- GHSA-6mqq-ppj3-rm94 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences