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

Q: How do I fix CVE-2026-9780?

netvault backup: upgrade to 14.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-9780 being exploited?

CVE-2026-9780 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-9780 affect?

CVE-2026-9780 affects netvault backup. Severity is high (CVSS 8.8). 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

This month

HIGH 8.8UPGRADE

CVE-2026-9780 is a high-severity flaw (CVSS 8.8) affecting netvault backup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 validati

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-25
Last modified	2026-10-25

Publisher (CNA): Zero Day Initiative · Vendor: quest

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 00:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

quest netvault backup UPGRADE

Affected: < 14.0.2

Fixed in: 14.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy netvault-backup || rpm -q netvault-backup || netvault-backup --version

2. UPGRADE to 14.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade netvault-backup

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade netvault-backup

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-9780?

netvault backup: upgrade to 14.0.2. Exact commands for each OS are on this page.

Is CVE-2026-9780 being exploited?

CVE-2026-9780 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-9780 affect?

CVE-2026-9780 affects netvault backup. Severity is high (CVSS 8.8). 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

How urgent is CVE-2026-9780?

Priority 46/100. High severity

Related CVEs

CVE-2026-9787 HIGH 8.8 UPGRADE Quest NetVault Backup NVBULogDaemon Command Injection Remote Code Execution Vulnerability
CVE-2026-7569 HIGH 8.8 UPGRADE Quest NetVault Backup viewclient Cross-Site Scripting Authentication Bypass Vulnerability
CVE-2026-7570 HIGH 8.8 UPGRADE Quest NetVault Backup NVBUDashboard SQL Injection Remote Code Execution Vulnerability
CVE-2026-9781 HIGH 8.8 UPGRADE Quest NetVault Backup NVBURASDevice SQL Injection Remote Code Execution Vulnerability
CVE-2026-9782 HIGH 8.8 UPGRADE Quest NetVault Backup NVBUDeviceDrive SQL Injection Remote Code Execution Vulnerability

References

← Back to latest CVEs