CVE-2026-9776 ATEN Unizon writeFileToHttpServletResponse Directory Traversal Information Disclosure Vulnerability

High 7.5 Published 24 Jun 2026 Updated 25 Jun 2026

Remote attackers can exploit a directory traversal flaw in ATEN Unizon to disclose sensitive information without authentication.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-9776?

CVE-2026-9776 is a high-severity path traversal vulnerability in ATEN Unizon, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

ATEN Unizon writeFileToHttpServletResponse Directory Traversal Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of ATEN Unizon. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the writeFileToHttpServletResponse method. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose information in the context of SYSTEM. Was ZDI-CAN-28505.

Weakness: CWE-22

Which versions are affected by CVE-2026-9776?

It affects 1 product.

Products include Aten Unizon.

How do I fix CVE-2026-9776?

No fix has been published for CVE-2026-9776 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-9776 being exploited?

There is no known exploitation of CVE-2026-9776 in the wild and no public exploit code.

Sources

Also known as GHSA-685c-hvrm-mjvc.