Server-Side Request Forgery in UniFi OS Devices

Publication date: 2026-07-02

Last updated on: 2026-07-10

Assigner: HackerOne

Description

A malicious actor with access to the network and low privileges could exploit a Server-Side Request Forgery (SSRF) to escalate privileges within such UniFi OS devices or instances.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-02

Last Modified

2026-07-10

Generated

2026-07-22

AI Q&A

2026-07-02

EPSS Evaluated

2026-07-21

NVD

CVE-2026-54401

EUVD

EUVD-2026-41392

Affected Vendors & Products

Vendor	Product	Version / Range
ui	unifi_os_server	to 5.1.15 (inc)
ui	unifi_dream_machine_firmware	to 5.1.15 (inc)
ui	unifi_dream_machine_pro_firmware	to 5.1.15 (inc)
ui	unifi_dream_machine_special_edition_firmware	to 5.1.15 (inc)
ui	unifi_dream_machine_pro_max_firmware	to 5.1.15 (inc)
ui	unifi_dream_machine_beast_firmware	to 5.1.15 (inc)
ui	enterprise_fortress_gateway_firmware	to 5.1.15 (inc)
ui	unifi_dream_router_firmware	to 5.1.15 (inc)
ui	unifi_dream_wall_firmware	to 5.1.15 (inc)
ui	unifi_dream_router_7_firmware	to 5.1.15 (inc)
ui	unifi_express_7_firmware	to 5.1.15 (inc)
ui	unifi_cloudkey_firmware	to 5.1.15 (inc)
ui	unifi_cloud_key_plus_firmware	to 5.1.15 (inc)
ui	unifi_cloudkey_enterprise_firmware	to 5.1.15 (inc)
ui	unifi_network_video_recorder_firmware	to 5.1.15 (inc)
ui	unifi_network_video_recorder_pro_firmware	to 5.1.15 (inc)
ui	unifi_network_video_recorder_instant_firmware	to 5.1.15 (inc)
ui	enterprise_network_video_recorder_firmware	to 5.1.15 (inc)
ui	enterprise_network_video_recorder_core_firmware	to 5.1.15 (inc)
ui	unifi_network_video_recorder_g2_firmware	to 5.1.15 (inc)
ui	unifi_network_video_recorder_g2_pro_firmware	to 5.1.15 (inc)
ui	unifi_cloud_gateway_ultra_firmware	to 5.1.15 (inc)
ui	unifi_cloud_gateway_max_firmware	to 5.1.15 (inc)
ui	unifi_cloud_gateway_industrial_firmware	to 5.1.15 (inc)
ui	unifi_cloud_gateway_fiber_firmware	to 5.1.15 (inc)
ui	unas_2_firmware	to 5.1.16 (inc)
ui	unas_4_firmware	to 5.1.16 (inc)
ui	unas_pro_firmware	to 5.1.16 (inc)
ui	unas_pro_4_firmware	to 5.1.16 (inc)
ui	unas_pro_8_firmware	to 5.1.16 (inc)
ui	enterprise_firewall_core_firmware	to 5.1.18 (inc)
ui	unifi_dream_router_5g_max_firmware	to 5.1.15 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

This vulnerability is a Server-Side Request Forgery (SSRF) issue affecting UniFi OS devices or instances. A malicious actor who has network access and low privileges can exploit this SSRF vulnerability to escalate their privileges within the affected system.

Impact Analysis

The impact of this vulnerability is that an attacker with limited access could gain higher privileges on UniFi OS devices or instances. This privilege escalation could allow the attacker to perform unauthorized actions or access sensitive parts of the system.

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