CVE-2026-3962 Jcharis Machine-Learning-Web-Apps Jinja2 Template app.py render_template cross site scripting
Remote attackers can execute arbitrary scripts via cross-site scripting in the Jinja2 template handler of the Machine-Learning-Web-Apps application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-3962?
CVE-2026-3962 is a medium-severity cross-site scripting vulnerability in Jcharis Machine-Learning-Web-Apps, published on 11 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A vulnerability was identified in Jcharis Machine-Learning-Web-Apps up to a6996b634d98ccec4701ac8934016e8175b60eb5. The impacted element is the function render_template of the file Machine-Learning-Web-Apps-master/Build-n-Deploy-Flask-App-with-Waypoint/app/app.py of the component Jinja2 Template Handler. Such manipulation leads to cross site scripting. It is possible to launch the attack remotely. The exploit is publicly available and might be used. This product takes the approach of rolling releases to provide continious delivery. Therefore, version details for affected and updated releases are not available. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-3962?
How do I fix CVE-2026-3962?
No fix has been published for CVE-2026-3962 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-2026-3962 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3962 exists.
Sources
Also known as GHSA-gj88-g2mg-f9rr.