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CVE-2026-77554 – Critical Command Injection (RCE) – Ubiquiti UniFi Talk Application < 5.3.2

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Summary

CVE-2026-77554 is a critical Improper Input Validation vulnerability (CWE-20) in the Ubiquiti UniFi Talk Application that allows a network-based attacker to execute arbitrary OS commands on the host device. The flaw requires no authentication or user interaction and carries a maximum CVSS v3.1 base score of 10.0, reflecting full compromise of confidentiality, integrity, and availability. It was disclosed by Ubiquiti in Security Advisory Bulletin 067.

Technical details

  • Root cause: Improper validation of user-supplied input within the UniFi Talk Application, which is passed through to a system-level command execution path.
  • Trigger conditions: A malicious actor with network access to the application can submit crafted input to trigger command injection on the underlying host.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Scope change (S:C) with high impact to confidentiality, integrity, and availability (C:H/I:H/A:H) — consistent with full host takeover via command execution.

Affected software

  • Ubiquiti UniFi Talk Application: all versions prior to 5.3.2

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade UniFi Talk Application to version 5.3.2 or later, as released by Ubiquiti.
  • If patching is delayed: Restrict network access to the application to trusted management networks only, and avoid exposing the UniFi Talk Application interface directly to the internet until patched.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: UniFi OS

References

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4

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IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

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6

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