7.5
HIGH
CVSS 3.1
CVE-2026-55110
UniFi OS CORS Misconfiguration Vulnerability
Overview
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.
Details
INFO
Published Date :
July 2, 2026, 3:17 p.m.
Last Modified :
July 9, 2026, 6:33 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Impact
Affected Products
The following products are affected by CVE-2026-55110
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
Restrict cross-origin requests and ensure proper CORS policy enforcement to prevent session hijacking.
- Review and restrict UniFi OS CORS policy.
- Disable unnecessary cross-origin resource sharing.
- Implement strict origin validation.
- Update UniFi OS to the latest version.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55110.
| URL | Resource |
|---|---|
| https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55110 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55110
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55110 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55110 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CWE NVD-CWE-Other Added CPE Configuration OR *cpe:2.3:a:ui:unifi_os_server:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_machine_beast_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_machine_beast:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_machine_pro_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_machine_pro:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_machine_special_edition_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_machine_special_edition:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_machine_pro_max_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_machine_pro_max:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_machine_beast_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_machine_beast:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:enterprise_fortress_gateway_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:enterprise_fortress_gateway:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_router_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_router:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_wall_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_wall:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_dream_router_7_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_dream_router_7:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_express_7_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_express_7:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_cloudkey_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_cloudkey:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_cloud_key_plus_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_cloud_key_plus:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_cloudkey_enterprise_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_cloudkey_enterprise:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_network_video_recorder_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_network_video_recorder:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_network_video_recorder_pro_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_network_video_recorder_pro:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_network_video_recorder_instant_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_network_video_recorder_instant:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:enterprise_network_video_recorder_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:enterprise_network_video_recorder:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:enterprise_network_video_recorder_core_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:enterprise_network_video_recorder_core:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_network_video_recorder_g2_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_network_video_recorder_g2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_network_video_recorder_g2_pro_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_network_video_recorder_g2_pro:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_cloud_gateway_ultra_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_cloud_gateway_ultra:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_cloud_gateway_max_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_cloud_gateway_max:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_cloud_gateway_industrial_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_cloud_gateway_industrial:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unifi_cloud_gateway_fiber_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.15 OR cpe:2.3:h:ui:unifi_cloud_gateway_fiber:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unas_2_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.16 OR cpe:2.3:h:ui:unas_2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unas_4_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.16 OR cpe:2.3:h:ui:unas_4:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unas_pro_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.16 OR cpe:2.3:h:ui:unas_pro:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unas_pro_4_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.16 OR cpe:2.3:h:ui:unas_pro_4:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:unas_pro_8_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.16 OR cpe:2.3:h:ui:unas_pro_8:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:ui:enterprise_firewall_core_firmware:*:*:*:*:*:*:*:* versions up to (including) 5.1.18 OR cpe:2.3:h:ui:enterprise_firewall_core:-:*:*:*:*:*:*:* Added Reference Type HackerOne: https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 02, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-55110', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-02T15:41:35.927153Z'} -
New CVE Received by [email protected]
Jul. 02, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Ubiquiti Inc', 'product': 'UniFi OS Server', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Dream Machines', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Enterprise Fortress Gateway', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Dream Wall', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Dream Routers', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Express 7', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Cloud Keys', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Network Video Recorders', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Enterprise Video Recorders', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Cloud Gateways', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Network Attached Storage', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Ubiquiti Inc', 'product': 'Enterprise Firewall Core', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.1.19', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-942 Added Reference https://community.ui.com/releases/Security-Advisory-Bulletin-066-066/984eceb3-49c8-4227-942d-671c289b3afc
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.