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Description

Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVault Backup. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the addclient3 webpage. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-27666.

PUBLISHED Reserved 2026-05-27 | Published 2026-06-24 | Updated 2026-06-25 | Assigner zdi




HIGH: 8.8CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unknown

14.0.1.7
affected

References

www.zerodayinitiative.com/advisories/ZDI-26-369/ (ZDI-26-369)

support.quest.com/...documents/netvault/14.0.2/release-notes (vendor-provided URL) vendor-advisory

cve.org (CVE-2026-9780)

nvd.nist.gov (CVE-2026-9780)

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