In Ciena's Navigator Network Control Suite (NCS) and Manage Control Plan (MCP), there are hidden system accounts used for internal software operations. Some of these accounts have default passwords that may be predictable. While these accounts have very limited permissions on their own, an attacker could combine an attack using one of these accounts with other potential weaknesses to launch a more significant attack, possibly leading to escalation of privilege on the system.
CVE-2026-5269
CRITICALPre-NVD 9.8Trending — 4 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.8
- EG Score
- 0.0(none)
- EPSS
- 4.1%
- KEV
- Not listed
Published
July 14, 2026
Last Modified
July 15, 2026
References (1)
- 7bd90cf1-1651-495e-9ae8-9415fb3c9febhttps://www.ciena.com/product-security
Vendor Advisories for CVE-2026-5269(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-07-15 14:49 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
- 2026-07-14 23:23 UTCNVD update
- 2026-07-14 22:45 UTCEG score recompute
- 2026-07-14 22:45 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-5269?
CVE-2026-5269 is a critical vulnerability published on July 14, 2026. In Ciena's Navigator Network Control Suite (NCS) and Manage Control Plan (MCP), there are hidden system accounts used for internal software operations. Some of these accounts have default passwords that may be predictable. While these accounts have very limited permissions on their own, an attacker…
When was CVE-2026-5269 disclosed?
CVE-2026-5269 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5269 actively exploited?
CVE-2026-5269 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-5269?
CVE-2026-5269 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
How do I remediate CVE-2026-5269?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5269, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-5269
Is Your Infrastructure Affected by CVE-2026-5269?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.