CVE-2026-54400
CVE-2026-54400 is a critical-severity vulnerability in Ui Unifi Access with a CVSS 3.x base score of 9.1. 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-284.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- EPSS exploit prediction: 1% (43rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-284
- Affected product: Ui Unifi Access
- Published:
- Last modified:
Description
A malicious actor with access to the network and high privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.
Frequently asked questions
- What is CVE-2026-54400?
- A malicious actor with access to the network and high privileges could exploit an Improper Access Control vulnerability found in UniFi Access Application to escalate privileges on the host device.
- How severe is CVE-2026-54400?
- CVE-2026-54400 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-54400 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-54400?
- CVE-2026-54400 affects Ui Unifi Access. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-54400?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2026-54400 published?
- CVE-2026-54400 was published on 2026-07-02 and last updated on 2026-08-17.
References
Affected products (1)
- cpe:2.3:a:ui:unifi_access:*:*:*:*:*:*:*:*
More vulnerabilities in Ui Unifi Access
- CVE-2025-52665 — Critical (CVSS 10.0): A malicious actor with access to the management network could exploit a misconfiguration in UniFi’s door access…
- CVE-2026-50748 — Critical (CVSS 9.9): A malicious actor with access to the network and low privileges could exploit an Improper Input Validation…
- CVE-2026-55117 — High (CVSS 8.6): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi Access…
All CVEs affecting Ui Unifi Access →
Other CWE-284 (Improper Access Control) vulnerabilities
- CVE-2026-83944 — Critical (CVSS 10.0): Improper access control in Azure Logic Apps allows an unauthorized attacker to elevate privileges over a network.
- CVE-2026-20192 — Critical (CVSS 10.0): As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine…
- CVE-2026-87230 — Critical (CVSS 10.0): Vulnerability in the Oracle Hyperion Financial Management product of Oracle Hyperion (component: Security). The…
- CVE-2026-54745 — Critical (CVSS 10.0): Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. Prior to 2.17.0,…
- CVE-2026-18886 — Critical (CVSS 10.0): ServiceNow has remediated an improper access control vulnerability that was identified in the ServiceNow AI platform.…
- CVE-2026-76607 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Missing ACL check in download element in Fabrik < 4.7.2.
Browse all CWE-284 (Improper Access Control) vulnerabilities →