CVE-2026-54403
CVE-2026-54403 is a high-severity vulnerability in Ui Unifi Os Server with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: High (CVSS 3.x base score 8.6)
- EPSS exploit prediction: 1% (54th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-22
- Affected product: Ui Unifi Os Server
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-54403?
- 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.
- How severe is CVE-2026-54403?
- CVE-2026-54403 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2026-54403 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-54403?
- CVE-2026-54403 primarily affects Ui Unifi Os Server. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-54403?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2026-54403 published?
- CVE-2026-54403 was published on 2026-07-02 and last updated on 2026-07-10.
References
Affected products (32)
- cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_machine_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_machine_pro_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_machine_special_edition_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_machine_pro_max_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_machine_beast_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:enterprise_fortress_gateway_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_router_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_wall_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_router_7_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_express_7_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_cloudkey_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_cloud_key_plus_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_cloudkey_enterprise_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_network_video_recorder_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_network_video_recorder_pro_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_network_video_recorder_instant_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:enterprise_network_video_recorder_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:enterprise_network_video_recorder_core_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_network_video_recorder_g2_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_network_video_recorder_g2_pro_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_cloud_gateway_ultra_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_cloud_gateway_max_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_cloud_gateway_industrial_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_cloud_gateway_fiber_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unas_2_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unas_4_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unas_pro_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unas_pro_4_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unas_pro_8_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:enterprise_firewall_core_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_router_5g_max_firmware:*:*:*:*:*:*:*:*
More vulnerabilities in Ui Unifi Os Server
- CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
- CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
- CVE-2026-34908 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS…
- CVE-2026-54402 — Critical (CVSS 9.9): A malicious actor with access to the network and low privileges could exploit an Improper Input Validation…
- CVE-2026-33000 — Critical (CVSS 9.1): A malicious actor with access to the network and high privileges could exploit an Improper Input Validation…
- CVE-2026-54404 — High (CVSS 8.8): A malicious actor with access to the network and low privileges could exploit a series of authenticated SQL Injection…
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