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CVE-2026-5267— Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS

Quick assessment

Affected
Ciena Navigator NCS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ciena Navigator 网络控制套件（NCS）中存在一个信息暴露漏洞，该漏洞位于事件流 API 中，由于未能正确执行身份验证，导致未授权的攻击者在能够访问受影响服务的网络条件下，可以访问事件流并可能获取敏感信息。

AI Predicted 5.3 Difficulty: Easy EPSS 0.36% · P28

Affected Version Matrix 16

VendorProduct Version RangeStatus
Ciena Navigator NCS 7.2 and any older release affected
7.2-P01 through 7.2-P07 affected
8.0 affected
8.0-P01 through 8.0-P06A affected
8.1 affected
8.1-P01 through 8.1-P06 affected
8.2 affected
8.2-P01 through 8.2-P06 affected
… +8 more rows
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I. Basic Information for CVE-2026-5267

Vulnerability Information
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Vulnerability Title
Unauthenticated Event Stream Exposure of Session Tokens in Navigator NCS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ciena Navigator NCS 7.2 and any older release -

II. Public POCs for CVE-2026-5267

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III. Intelligence Information for CVE-2026-5267

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IV. Related Vulnerabilities

Same product: Navigator NCS
Same vendor: Ciena
Same weakness: CWE-306

V. Comments for CVE-2026-5267

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