CVE-2026-5268
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
An authentication bypass vulnerability in the default SFTP server used across Ciena products allows a remote, unauthenticated attacker to bypass security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could allow reading or modifying system files.
Risk Assessment
The risk includes full compromise of data confidentiality and integrity on Ciena systems, potentially leading to sensitive information leakage or network disruption.
Recommendation
Immediately apply the vendor-supplied patch for the vulnerable SFTP server and restrict network access to this component to trusted hosts only.
Related vulnerabilities
- CVE-2026-82533Critical
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability in its local HTTP control-plane API that allows attackers to gain full agent control by supplying a spoofed Host header, as the server validates only the client-supplied Host header value rather than the actual TCP connection origin.
- CVE-2026-26084Critical
An improper access control vulnerability in Fortinet FortiSandbox versions 5.0.0 through 5.0.5, 4.4.0 through 4.4.8, Cloud 5.0.4 through 5.0.5, and PaaS 5.0.4 through 5.0.5 may allow an attacker to access sensitive information via crafted HTTP requests.
- CVE-2026-79576Critical
An issue in the Single-Sign On (SSO) component of Digital-Infrastructure v9.6.7 allows attackers to authenticate as any user, including the Admin, without a password.
- CVE-2026-61516Critical
Netis NX10 firmware versions V4.0.1.5808 and V3.0.0.4142 contain an information disclosure vulnerability that allows unauthenticated attackers to retrieve the administrator password by sending a request to the sysinfo action in the web management interface without a valid session.
- CVE-2026-12745Critical
A deserialization of untrusted data vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote unauthenticated attacker to execute arbitrary code on the server.
- CVE-2026-12744Critical
A deserialization of untrusted data vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote unauthenticated attacker to execute arbitrary code on the server.
- CVE-2026-12650Critical
A deserialization of untrusted data vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated attacker to execute arbitrary code on the server.
- CVE-2026-12647Critical
A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated attacker to execute arbitrary code on the server.
- CVE-2026-12646Critical
A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated attacker to execute arbitrary code on the server.
- CVE-2026-12645Critical
A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated attacker to execute arbitrary code on the server.
Original NVD description (English source)
An authentication bypass vulnerability exists in the default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could allow an attacker to read or modify system files.