CVE-2026-77533: CWE-20 Improper input validation in Ubiquiti Inc UniFi Protect Application
Description
CVE-2026-77533 is a critical vulnerability in the Ubiquiti Inc UniFi Protect Application involving improper input validation. An attacker with network access and low privileges could exploit this flaw to perform command injection on the host device, potentially leading to full system compromise. The vulnerability has a high CVSS score of 9.9, indicating severe impact on confidentiality, integrity, and availability. No patch or official remediation guidance has been provided yet. There are no known exploits in the wild at this time.
CVSS v3.1
Score 9.9critical
Affected software
Ubiquiti Inc
UniFi Protect Application
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-77533) in the UniFi Protect Application is due to improper input validation (CWE-20), allowing a low-privileged attacker with network access to execute arbitrary commands on the host device via command injection. The CVSS 3.1 base score is 9.9 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H), reflecting network attack vector, low attack complexity, low privileges required, no user interaction, and complete impact on system confidentiality, integrity, and availability. The vulnerability is published but no remediation level or patch is currently documented.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary commands on the host device, leading to full compromise of the system, including unauthorized disclosure, modification, or destruction of data and disruption of service.
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 Protect Application to trusted users only and monitor for suspicious activity. Avoid exposing the application to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Ubiquiti
- Date Reserved
- 2026-08-20T20:32:30.112Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8eacdfacd9273b49a440a3
Added to database: 08/26/2026, 09:07:43 UTC
Last enriched: 09/09/2026, 19:22:33 UTC
Last updated: 10/08/2026, 18:48:48 UTC
Views: 89
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