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CVE-2026-9780— Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability

Quick assessment

Affected
Quest NetVault Backup
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Quest NetVault Backup是美国Quest公司的一款跨平台的企业级数据备份与恢复软件解决方案。 Quest NetVault Backup 14.0.1.7版本存在跨站脚本漏洞，该漏洞源于addclient3网页对用户提供的数据缺乏正确的验证，可能导致注入任意脚本，从而绕过身份验证。

AI Predicted 8.8 Difficulty: Moderate EPSS 0.94% · P60

Affected Version Matrix 1

VendorProduct Version RangeStatus
Quest NetVault Backup 14.0.1.7 affected
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I. Basic Information for CVE-2026-9780

Vulnerability Information
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Vulnerability Title
Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Quest NetVault Backup 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Quest NetVault Backup是美国Quest公司的一款跨平台的企业级数据备份与恢复软件解决方案。 Quest NetVault Backup 14.0.1.7版本存在跨站脚本漏洞，该漏洞源于addclient3网页对用户提供的数据缺乏正确的验证，可能导致注入任意脚本，从而绕过身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Quest NetVault Backup 14.0.1.7 -

II. Public POCs for CVE-2026-9780

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III. Intelligence Information for CVE-2026-9780

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Vendor Advisories for CVE-2026-9780 (1)

Same Patch Batch · Quest · 2026-06-24 · 10 CVEs total

CVE-2026-7569 Quest NetVault Backup viewclient Cross-Site Scripting Authentication Bypass Vulnerability
CVE-2026-7570 Quest NetVault Backup NVBUDashboard SQL Injection Remote Code Execution Vulnerability
CVE-2026-9783 Quest NetVault Backup NVBURemovableMedia SQL Injection Remote Code Execution Vulnerability
CVE-2026-9787 Quest NetVault Backup NVBULogDaemon Command Injection Remote Code Execution Vulnerability
CVE-2026-9781 Quest NetVault Backup NVBURASDevice SQL Injection Remote Code Execution Vulnerability
CVE-2026-9784 Quest NetVault Backup NVBULibraryPort SQL Injection Remote Code Execution Vulnerability
CVE-2026-9782 Quest NetVault Backup NVBUDeviceDrive SQL Injection Remote Code Execution Vulnerability
CVE-2026-9785 Quest NetVault Backup NVBULibrarySlot SQL Injection Remote Code Execution Vulnerability
CVE-2026-9786 Quest NetVault Backup NVBUDashboard SQL Injection Remote Code Execution Vulnerability

IV. Related Vulnerabilities

Same product: NetVault Backup
Same vendor: Quest
Same weakness: CWE-79

V. Comments for CVE-2026-9780

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