CVE-2025-40834 Cross-site scripting in Mendix RichText
An attacker can execute cross-site scripting attacks via the Mendix RichText widget due to improper input neutralization.
- 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-2025-40834?
CVE-2025-40834 is a medium-severity cross-site scripting vulnerability in Siemens Mendix RichText, published on 17 Nov 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A vulnerability has been identified in Mendix RichText (All versions >= V4.0.0 < V4.6.1). Affected widget does not properly neutralize the input. This could allow an attacker to execute cross-site scripting attacks.
Weakness: CWE-79
Which versions are affected by CVE-2025-40834?
How do I fix CVE-2025-40834?
No fix has been published for CVE-2025-40834 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-2025-40834 being exploited?
There is no known exploitation of CVE-2025-40834 in the wild and no public exploit code.
Sources
Also known as GHSA-7xr6-x66r-h3w5.