CVE-2026-5270

9.8 criticalEPSS 0.7%

Critical (9.8). EPSS 0.7% chance of exploitation in the next 30 days.

An authentication bypass vulnerability exists in certain releases of Ciena Navigator Network Control Suite (NCS), Manage Control Plan (MCP), and Blue Planet products. The issue is caused by improper handling of HTTP request paths and headers, which allows an unauthenticated attacker to manipulate requests in a manner that bypasses authentication and associated audit logging controls.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2026-07-14
Modified: 2026-07-15
Record from: the NVD, synced 2026-10-19

References

https://www.ciena.com/product-security

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