CVE-2026-5267Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS
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It affects Ciena Navigator NCS. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-306
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Ciena
- NVD analysis
- Deferred
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Ciena Navigator NCS ciena:navigator_ncs (from the name) | 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; and 8 more ranges | CNA record |
References
- https://www.ciena.com/product-security
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.