Stored Cross-site Scripting (XSS) Vulnerability in the MGate 5121/5122/5123 Series

published 2025-01-15 last yr. modified 2026-06-17 4mo ago also EUVD-2025-1531

cvss: 5.2; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits: 0; none known

A stored Cross-site Scripting (XSS) vulnerability exists in the MGate 5121/5122/5123 Series firmware version v1.0 because of insufficient sanitization and encoding of user input in the "Login Message" functionality. An authenticated attacker with administrative access can exploit this vulnerability to inject malicious scripts that are continuously stored on the device. These scripts are executed when other users access the login page, potentially resulting in unauthorized actions or other impacts, depending on the user's privileges.

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: last yr. (2025-01-15)

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.2	CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
CNA	4.0	5.2	CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

Moxa MGate 5121 Series
Moxa MGate 5122 Series
Moxa MGate 5123 Series

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

moxa.com /en/support/product-support/security-advisory/mpsa-247733-cve-2025-0193-stored-cross-site-scripting-(xss)-vuln
vendor-advisory

Sources

CVE List CVE-2025-0193
NVD CVE-2025-0193

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