CVE-2026-77546: CWE-20 Improper input validation in Ubiquiti Inc UniFi Access Application
Description
CVE-2026-77546 is a critical Improper Input Validation vulnerability in the Ubiquiti Inc UniFi Access Application. It allows a low-privileged attacker with network access to perform command injection on the host device, potentially leading to full system compromise. The vulnerability has a CVSS score of 9.9, indicating high impact on confidentiality, integrity, and availability. No patch or official remediation guidance is currently available from the vendor. There are no known exploits in the wild at this time.
CVSS v3.1
Score 9.9critical
Affected software
Ubiquiti Inc
UniFi Access Application
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-77546) in the UniFi Access Application arises from improper input validation (CWE-20). An attacker with network access and low privileges can exploit this flaw to execute arbitrary commands on the host system, resulting in complete compromise of the device. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no user interaction, and full impact on confidentiality, integrity, and availability. The vendor has published the vulnerability but has not yet provided a remediation or patch. The affected versions are not explicitly stated.
Potential Impact
Successful exploitation allows an attacker with low privileges on the network to execute arbitrary commands on the host device, leading to full compromise of confidentiality, integrity, and availability of the system running the UniFi Access Application.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the UniFi Access Application and monitor for suspicious activity. Follow vendor updates closely for official patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Ubiquiti
- Date Reserved
- 2026-08-20T20:32:37.793Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8ec1fbacd9273b49be1531
Added to database: 08/26/2026, 10:37:47 UTC
Last enriched: 09/09/2026, 18:52:10 UTC
Last updated: 10/10/2026, 18:48:22 UTC
Views: 75
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