Vulnerability · Published Jun 24, 2026 · Assigned by zdi

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

High 7.5

In plain English

A high-severity path traversal in Unizon from ATEN. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 79% of all known vulnerabilities).

Severity (CVSS 3.0)7.5High

Exploit odds (30 days)1.9%top 20.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
ATEN	Unizon	2.7.262.002

Weakness: CWE-22 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

ZDI-26-380 x_research-advisory
vendor-provided URL vendor-advisory