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CVE-2026-5267highCWE-306

Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.4%
exploitation probability
0.4%top 73% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Ciena · Navigator NCS