CVE-2026-54403
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
A Path Traversal vulnerability in devices running UniFi OS allows an attacker with network access to bypass authentication. The flaw affects specific UniFi OS devices or instances.
Risk Assessment
An attacker can gain unauthorized access to the UniFi OS device or instance, potentially leading to network compromise and data confidentiality breach.
Recommendation
Immediately update UniFi OS to the latest version provided by the vendor and restrict network access to the devices to trusted hosts only.
Other vulnerabilities in UniFi OS
See all- CVE-2026-77550Critical
An attacker with network access could exploit an Improper Neutralization of CRLF Sequences vulnerability in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
- CVE-2026-77549Critical
An attacker with network access and under certain conditions could exploit an Improper Neutralization of CRLF Sequences vulnerability in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
- CVE-2026-77545Critical
An attacker with network access, low privileges, and under certain conditions can exploit an active debug code vulnerability in devices running UniFi OS to escalate privileges within those devices or instances.
- CVE-2026-77536Critical
An attacker with network access and low privileges could exploit an Improper Access Control vulnerability in devices running UniFi OS to escalate privileges within such devices or instances.
- CVE-2026-77534Critical
An attacker with network access and low privileges could exploit an Improper Access Control vulnerability in devices running UniFi OS to escalate privileges within such devices or instances.
- CVE-2026-55116Critical
A vulnerability in UniFi OS allows unauthorized changes to devices by an attacker with network access under certain network configurations.
- CVE-2026-54402Critical
A vulnerability in UniFi OS allows an attacker with network access and low privileges to execute command injection on the host device due to improper input validation.
- CVE-2026-47370Critical
Certain devices running UniFi OS are vulnerable to improper input validation, allowing a malicious actor with low privileges to execute a Command Injection attack.
- CVE-2026-47369Critical
A vulnerability related to improper input validation exists in devices running UniFi OS, which could be exploited by a malicious actor with low privileges to escalate privileges.
- CVE-2026-34910CriticalActively exploited
Command Injection vulnerability in UniFi OS devices. Improper input validation allows an attacker with network access to execute arbitrary system commands.
Original NVD description (English source)
A malicious actor with access to the network could exploit a Path Traversal vulnerability found in certain devices running UniFi OS to bypass authentication of such UniFi OS devices or instances.