What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-10-25
• Weakness: CWE-22

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.

Affected products

• ATEN Unizon: before 2.7.264 — fixed in 2.7.264

How to fix

Upgrade to a fixed version: ATEN Unizon 2.7.264. Check the vendor advisory for mitigations.

References

• https://www.aten.com/global/en/supportcenter/info/security-advisory/29/
• https://www.zerodayinitiative.com/advisories/ZDI-26-380/

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