CVE-2026-55110
CVE-2026-55110 is a high-severity vulnerability in Ui Unifi Os Server with a CVSS 3.x base score of 7.5. 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-942.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 0% (5th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-942
- Affected product: Ui Unifi Os Server
- Published:
- Last modified:
Description
A malicious actor who lures an authenticated user to a malicious page could exploit a Cross-Origin Resource Sharing (CORS) misconfiguration found in UniFi OS to trigger actions in UniFi OS using that user's session.
Frequently asked questions
- What is CVE-2026-55110?
- A malicious actor who lures an authenticated user to a malicious page could exploit a Cross-Origin Resource Sharing (CORS) misconfiguration found in UniFi OS to trigger actions in UniFi OS using that user's session.
- How severe is CVE-2026-55110?
- CVE-2026-55110 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-55110 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-55110?
- CVE-2026-55110 primarily affects Ui Unifi Os Server. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-55110?
- 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-2026-55110 published?
- CVE-2026-55110 was published on 2026-07-02 and last updated on 2026-07-09.
References
Affected products (30)
- cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:*
- cpe:2.3:o:ui:unifi_dream_machine_beast_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: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:*:*:*:*:*:*:*:*
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Other CWE-942 vulnerabilities
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- CVE-2022-31736 — Critical (CVSS 9.8): A malicious website could have learned the size of a cross-origin resource that supported Range requests. This…
- CVE-2026-34449 — Critical (CVSS 9.6): SiYuan is a personal knowledge management system. Prior to version 3.6.2, a malicious website can achieve Remote Code…
- CVE-2026-30924 — Critical (CVSS 9.6): qui is a web interface for managing qBittorrent instances. Versions 1.14.1 and below use a permissive CORS policy that…
- CVE-2026-9739 — Critical (CVSS 9.4): Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we implemented…
- CVE-2026-61736 — Critical (CVSS 9.3): LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.4, the server defaults to CORS_ORIGINS=*…