CVE-2025-40834Network attack vector

Cross-site scripting via incomplete input neutralization

Published Nov 17, 2025 · Updated Nov 17, 2025

Cross-site scripting in Siemens Mendix RichText 4.0.0 through 4.6.0 allows remote authenticated users to execute script in another user's browser. The version 4 widget's input sanitizer fails to neutralize attacker-controlled rich-text markup before converting it to HTML rendered directly in the application page rather than a sandboxed frame. Low-privileged access and victim interaction are required; exploitation exposes data available to the victim's browser context without reported integrity or availability impact.

CVSS severity6.8
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Siemens Mendix RichText 4.0.0 through 4.6.0 allows remote authenticated users to execute script in another user's browser. The version 4 widget's input sanitizer fails to neutralize attacker-controlled rich-text markup before converting it to HTML rendered directly in the application page rather than a sandboxed frame. Low-privileged access and victim interaction are required; exploitation exposes data available to the victim's browser context without reported integrity or availability impact.

The record

CVE
CVE-2025-40834
Published
Nov 17, 2025
Updated
Nov 17, 2025
Vendor
Siemens
Product
Mendix RichText
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=V4.0.0 <V4.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · Mendix RichTextversion=V4.0.0 <V4.6.1

Published CVSS scores

5.7Siemens AGCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
6.8Siemens AGCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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