CVE-2023-27990

MediumCVSS 4.8/10Last modified Jun 17, 2026

Description

The cross-site scripting (XSS) vulnerability in Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow an authenticated attacker with administrator privileges to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed when the user visits the Logs page of the GUI on the device.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
Zyxel	ATP series firmware	4.32 through 5.35
Zyxel	USG FLEX series firmware	4.50 through 5.35
Zyxel	USG FLEX 50(W) firmware	4.16 through 5.35
Zyxel	USG20(W)-VPN firmware	4.16 through 5.35
Zyxel	VPN series firmware	4.30 through 5.35

References

Timeline

Published: Apr 24, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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