CVE-2025-6235 ExtremeControl (NAC) 'onmouseover' XSS
An attacker can inject malicious scripts into the ExtremeControl login interface, potentially stealing user data or performing unauthorized actions in the victim's browser.
- 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-2025-6235?
CVE-2025-6235 is a medium-severity cross-site scripting vulnerability in ExtremeControl, published on 21 Jul 2025. 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
In ExtremeControl before 25.5.12, a cross-site scripting (XSS) vulnerability was discovered in a login interface of the affected application. The issue stems from improper handling of user-supplied input within HTML attributes, allowing an attacker to inject script code that may execute in a user's browser under specific interaction conditions. Successful exploitation could lead to exposure of user data or unauthorized actions within the browser context.
Weakness: CWE-79
Which versions are affected by CVE-2025-6235?
It affects 1 product.
Products include Extremenetworks Extremecontrol.
How do I fix CVE-2025-6235?
No fix has been published for CVE-2025-6235 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-2025-6235 being exploited?
There is no known exploitation of CVE-2025-6235 in the wild and no public exploit code.
Sources
Also known as GHSA-7x23-63hm-q73v.