CVE-2019-25323 Heatmiser Netmonitor 3.03 - HTML Injection
Attackers can inject malicious HTML into the Netmonitor web interface via the outputtitle parameter, potentially manipulating displayed content.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2019-25323?
CVE-2019-25323 is a medium-severity cross-site scripting vulnerability in Heatmiser Netmonitor, published on 12 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2019-25323?
How do I fix CVE-2019-25323?
No fix has been published for CVE-2019-25323 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2019-25323 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25323 exists.
Sources
Also known as GHSA-rxgx-jjvj-9w6v.