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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Quest | Netvault Backup | < 14.0.2 |
Related Weaknesses (CWE)
References
- https://support.quest.com/technical-documents/netvault/14.0.2/release-notes#TOPIRelease Notes
- https://www.zerodayinitiative.com/advisories/ZDI-26-369/Vendor Advisory
FAQ
What is CVE-2026-9780?
CVE-2026-9780 is a vulnerability with a CVSS score of 8.8 (HIGH). Quest NetVault Backup addclient3 Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Quest NetVau...
How severe is CVE-2026-9780?
CVE-2026-9780 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-9780?
Check the references section above for vendor advisories and patch information. Affected products include: Quest Netvault Backup.