CVE-2026-9780 Details
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.
An authentication bypass vulnerability has been identified in Quest NetVault Backup version 14.0.2. This issue arises from a cross-site scripting flaw in the addclient3 webpage, where user-supplied data is not properly validated. As a result, an attacker can inject arbitrary scripts, potentially leading to the execution of arbitrary code with SYSTEM privileges. Exploitation requires user interaction, such as visiting a malicious page or opening a harmful file.
Quest has released an update to address this vulnerability. Details can be found in the Quest NetVault Backup 14.0.2 release notes.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 25, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://support.quest.com/technical-documents/netvault/14.0.2/release-notes#TOPIC-2338529 | [email protected] | Release Notes |
| https://www.zerodayinitiative.com/advisories/ZDI-26-369/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| quest netvault backup | < 14.0.2 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 26, 2026 | Initial Analysis | [email protected] |
| Jun 25, 2026 | CVE Modified | CISA-ADP |
| Jun 25, 2026 | New CVE Received | [email protected] |