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CVE-2026-9780

Published: Jun 24, 2026Updated: Jun 26, 2026 Sources: CVE List NVDCWE-79
8.8HIGH
NVD MITRE
EPSS Score
0.9%
Top 41.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-79

Affected Products

Quest
commercial·US
NetVault BackupOn-prem
Enterprise Software / itsm-monitoring
and 1 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-9780?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://www.zerodayinitiative.com/advisories/ZDI-26-369/
zerodayinitiative.com
https://support.quest.com/technical-documents/netvault/14.0.2/release-notes#TOPIC-2338529
support.quest.com

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