CVE-2026-5269
CRITICALDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 19% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1393 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-45249 | Critical | 9.8 | 53% | KEV | Fix |
| CVE-2024-29021 | Critical | 9.0 | 20% | - | - |
| CVE-2025-26793 | Unscored | - | 2.3% | - | - |
| CVE-2024-48987 | Medium | 6.6 | 1.0% | - | Fix |
| CVE-2026-2635 | High | 7.3 | 1.0% | - | - |
| CVE-2023-25131 | Critical | 9.4 | 1.0% | - | - |
Common questions
How do I fix CVE-2026-5269?
No published fix for CVE-2026-5269 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-5269 being actively exploited?
Not that we know of. CVE-2026-5269 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.27% is the estimated probability that it will be exploited in the next 30 days. That is higher than 19% of all scored CVEs.
How severe is CVE-2026-5269?
CVE-2026-5269 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.