CVE-2026-33911 OpenEMR vulnerable to reflected XSS in graphs.php via title parameter

Medium 5.4 Published 25 Mar 2026 Updated 26 Mar 2026

An authenticated attacker can execute arbitrary JavaScript in a victim's session via reflected XSS in the title parameter of graphs.php.

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-2026-33911?

CVE-2026-33911 is a medium-severity cross-site scripting vulnerability in Open-Emr Openemr, published on 25 Mar 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

OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0.3, the POST parameter `title` is reflected back in a JSON response built with `json_encode()`. Because the response is served with a `text/html` Content-Type, the browser interprets injected HTML/script tags rather than treating the output as JSON. An authenticated attacker can craft a request that executes arbitrary JavaScript in a victim's session. Version 8.0.0.3 contains a fix.

Weakness: CWE-79

Which versions are affected by CVE-2026-33911?

It affects 1 product.

Products include Open-Emr Openemr.

How do I fix CVE-2026-33911?

No fix has been published for CVE-2026-33911 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-2026-33911 being exploited?

There is no known exploitation of CVE-2026-33911 in the wild and no public exploit code.

All Open-Emr Openemr vulnerabilities

Sources

Also known as GHSA-wwhf-6cvc-6766.