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CVE-2026-9776 – Unauthenticated Directory Traversal / Arbitrary File Read – ATEN Unizon prior to …

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Summary

CVE-2026-9776 is a high-severity directory traversal vulnerability (CWE-22) in ATEN Unizon, a server-based AV and IT management platform, affecting all versions prior to FW V2.7.264.001. An unauthenticated remote attacker can exploit improper path validation in the writeFileToHttpServletResponse method to read arbitrary files from the server in the NT SYSTEM security context. ATEN has released patched firmware version V2.7.264.001 to remediate this issue.

Technical details

  • Root cause: The /rest/history/report/getFile endpoint fails to properly validate user-supplied path input before passing it to the writeFileToHttpServletResponse method, allowing directory traversal sequences to escape the intended file-serving directory boundary.
  • Trigger conditions: No authentication or user interaction is required; the vulnerable HTTP endpoint is directly accessible over the network with no special preconditions.
  • Attack vector: Network (HTTP/HTTPS) — an attacker sends a crafted request to the endpoint containing path traversal sequences to reach and read files outside the restricted directory.
  • Impact: Unauthorized disclosure of arbitrary files from the server filesystem operating in the NT SYSTEM security context, potentially exposing credentials, application configuration files, and other sensitive system data.

Affected software

  • ATEN Unizon prior to FW V2.7.264.001 (confirmed affected version: 2.7.262.002)

Severity

CVSS v3.0 Base Score: 7.5 (High)
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Upgrade ATEN Unizon to FW V2.7.264.001 or later, as provided by ATEN in their official security advisory (Security Advisory 2026-SA-4).
  • If immediate patching is not possible: Restrict network access to the ATEN Unizon web management interface; ensure it is not reachable from the public internet and is isolated to trusted internal network segments only.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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