CVE-2026-9780
Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass 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.
INFO
Published Date :
June 24, 2026, 11:13 p.m.
Last Modified :
June 24, 2026, 11:13 p.m.
Remotely Exploit :
No
Source :
zdi
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.0 | HIGH | 99f1926a-a320-47d8-bbb5-42feb611262e |
Solution
- Update Quest NetVault Backup to the latest version.
- Apply any available security patches from the vendor.
- Review access controls and authentication mechanisms.
- Restrict access to the addclient3 webpage.
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