All vulnerabilities
CVE-2026-5267

Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS

Ciena Navigator NCS
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.36%Chance of exploitation activity in the next 30 days, higher than 28% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published25 Sep 2026Updated 25 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 16

  • Navigator NCSaffected: 7.2 and any older releaseCVE List
  • Navigator NCSaffected: 7.2-P01 through 7.2-P07CVE List
  • Navigator NCSaffected: 8.0CVE List
  • Navigator NCSaffected: 8.0-P01 through 8.0-P06ACVE List
  • Navigator NCSaffected: 8.1CVE List
  • Navigator NCSaffected: 8.1-P01 through 8.1-P06CVE List
  • Navigator NCSaffected: 8.2CVE List
  • Navigator NCSaffected: 8.2-P01 through 8.2-P06CVE List
  • Navigator NCSaffected: 9.0CVE List
  • Navigator NCSaffected: 9.0-P01 through 9.0-P05ACVE List
  • Navigator NCSaffected: 9.1CVE List
  • Navigator NCSaffected: 9.1-P01 through 9.1-P05CVE List
  • Navigator NCSaffected: 9.2CVE List
  • Navigator NCSaffected: 9.2-P01 through 9.2-P02CVE List
  • Navigator NCSaffected: 10.0CVE List
  • Navigator NCSaffected: 10.0-P01 through 10.0-P01BCVE List

References 1