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.
The record classifies CVE-2026-54403 under weakness class CWE-22. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 118 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.6 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N - EPSS (FIRST)
- 0.7% probability of exploitation in the next 30 days, higher than 54.4% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-07-02
Is CVE-2026-54403 being exploited?
It currently carries a trending score of 24 in the Threadlinqs vulnerability feed.
Affected products and versions
- Ubiquiti Inc: UniFi OS Server, Dream Machines, Enterprise Fortress Gateway, Dream Wall, Dream Routers, Express 7, Cloud Keys, Network Video Recorders, Enterprise Video Recorders, Cloud Gateways, Network Attached Storage, Enterprise Firewall Core
How to fix CVE-2026-54403
No vendor patch reference has been recorded for CVE-2026-54403 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-54403
1 tracked threat in the Threadlinqs corpus references CVE-2026-54403, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on .