Ubiquiti has released security updates to address several critical security flaws, led by CVE-2026-50746, a maximum-severity UniFi OS vulnerability with a CVSS score of 10.0. Published in Security Advisory Bulletin 066 on July 2, 2026, the update resolves 25 vulnerabilities affecting UniFi OS and multiple applications, including UniFi Connect, Talk, Access, Protect, and Network.
CVE-2026-50746 Tops List of Critical UniFi OS Vulnerability Patches
The most severe issue, CVE-2026-50746, affects UniFi Connect Application versions 3.4.16 and earlier. The software is used to manage commercial building operations, including smart LED lighting systems and electric vehicle chargers, from a centralized interface.
According to Ubiquiti, “A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi Connect Application to execute a Command Injection on the host device.”
The advisory recommends upgrading the UniFi Connect Application to version 3.4.20 or later. The flaw carries a CVSS v3.1 score of 10.0 with the vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H and was reported by Duc Anh Nguyen (@heckintosh_).
Additional UniFi OS vulnerability fixes
Alongside CVE-2026-50746, Ubiquiti patched six additional critical vulnerabilities on Thursday. These include CVE-2026-50747 and CVE-2026-50748, affecting UniFi Talk and UniFi Access, respectively, both carrying CVSS scores of 9.9. The company also fixed CVE-2026-54402, a command injection flaw in UniFi OS; CVE-2026-55115, an SSRF vulnerability in UniFi Protect; and CVE-2026-55116, an improper access control issue that allowed unauthorized changes to affected devices. Each requires software updates to the latest supported releases.
The advisory also addresses several high-severity vulnerabilities, including CVE-2026-54401 (SSRF), CVE-2026-54403 (path traversal), CVE-2026-54404 (SQL injection), and multiple authentication bypass, privilege escalation, denial-of-service, path traversal, SQL injection, CORS, and improper access control flaws affecting UniFi OS, UniFi Network, UniFi Protect, UniFi Talk, UniFi Access, and UniFi Protect Floodlight.
Notably, Ubiquiti warned that CVE-2026-54403 can be chained with other vulnerabilities to remove the requirement for low-privileged access, increasing its exploitation potential.
Affected products include UniFi OS Server, UDM, UDM-Pro, UDM-SE, UDM-Pro-Max, UDM-Beast, EFG, UDW, UDR, UDR7, UDR-5G, Express 7, Cloud Key devices, UNVR systems, ENVR platforms, UCG appliances, EF-Core, and multiple UNAS storage products running vulnerable software versions.
Ubiquiti advises customers to update UniFi OS devices to version 5.1.19 or later, where applicable, and to upgrade UniFi Talk to version 5.2.2, UniFi Access to version 4.2.29, UniFi Protect to version 7.1.83, and UniFi Network to version 10.4.57. Prompt installation of these updates is recommended to mitigate the risks associated with CVE-2026-50746 and the broader UniFi OS vulnerability disclosures.
