What is CVE-2026-9780?

CVE-2026-9780 is a high-severity vulnerability in Quest Netvault Backup, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-06-25.

How severe is CVE-2026-9780?

High severity. CVSS v3 base score is 8.8 out of 10.

XSS in Quest Netvault Backup

CVE-2026-9780

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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.007 (48.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Quest Netvault Backup — versions 14.0.1.7
Quest Netvault_backup

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

zdi-disclosures@trendmicro.com (x_research-advisory, Vendor Advisory)
zdi-disclosures@trendmicro.com (vendor-advisory, Release Notes)

Frequently asked questions

What is CVE-2026-9780?: CVE-2026-9780 is a high-severity vulnerability in Quest Netvault Backup, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-06-25.
How severe is CVE-2026-9780?: High severity. CVSS v3 base score is 8.8 out of 10.