CVE-2026-47790 PUBLISHED

Privilege Escalation via QuFTP Log-based XSS

Assigner: qnap
Reserved: 20.05.2026 Published: 15.10.2026 Updated: 15.10.2026

A cross-site scripting (XSS) vulnerability has been reported to affect QuFTP Service. If a remote attacker gains a user account, they can then exploit the vulnerability to inject malicious code.

We have already fixed the vulnerability in the following version: QuFTP Service 1.4.6 and later QuFTP Service 1.5.5 and later QuFTP Service 1.6.5 and later

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:N/VA:N/SC:H/SI:H/SA:H
CVSS Score: 6.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	High
Attack Requirements	None	Availability	None	Availability	High
Privileges Required	Low
User Interaction	Active

CVSS 4.0

Product Status

Vendor	QNAP Systems Inc.
Product	QuFTP Service
Versions	Default: unaffected affected from 1.4.x to 1.4.6 (excl.) affected from 1.5.x to 1.5.5 (excl.) affected from 1.6.x to 1.6.5 (excl.)

Solutions

We have already fixed the vulnerability in the following version: QuFTP Service 1.4.6 and later QuFTP Service 1.5.5 and later QuFTP Service 1.6.5 and later

Credits

Ahmad Mamdouh finder

References

https://www.qnap.com/en/app-release-notes?keyword=QuFTP%20Service&app=QuFTP&product-line=nas

Problem Types

CWE-79 CWE

Impacts

CAPEC-592