CVE-2026-38947
Cross-Site Scripting (XSS) in FluentCMS TextHTML Plugin
Publication date: 2026-05-05
Last updated on: 2026-05-06
Assigner: MITRE
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| fluentcms | fluentcms | 1.2.3 |
| fluentcms | texthtml_plugin | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a Cross Site Scripting (XSS) issue found in the TextHTML plugin of FluentCMS version 1.2.3.
Specifically, on the /pagepreview page, user input is not properly sanitized before being included in the HTTP response. This means an attacker can create a malicious URL that, when visited, executes arbitrary JavaScript code in the victim's browser.
The attack can be performed by accessing the page preview, selecting the TextHTML plugin, editing it to insert a malicious payload, submitting the changes, and then refreshing the page to trigger the script.
The issue arises because of insufficient input validation and output encoding on both the frontend and backend.
How can this vulnerability impact me? :
This vulnerability can allow an attacker to execute arbitrary JavaScript code in the browser of anyone who visits the affected page preview.
Such code execution can lead to theft of sensitive information like cookies or session tokens, unauthorized actions performed on behalf of the user, or redirection to malicious sites.
Overall, it compromises the security and trustworthiness of the affected website and can lead to user data exposure or account compromise.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by attempting to reproduce the XSS issue on the /pagepreview page of FluentCMS. Specifically, you can try accessing the page preview, selecting the TextHTML plugin, editing it to insert a known XSS payload, submitting the changes, and then refreshing the page to see if the script executes.
There are no specific network or system commands provided to detect this vulnerability automatically.
What immediate steps should I take to mitigate this vulnerability?
The immediate mitigation step is to implement proper input validation and output encoding on both the frontend and backend of the TextHTML plugin in FluentCMS.
Until a patch is applied, avoid using or exposing the /pagepreview page with the TextHTML plugin to untrusted users to reduce the risk of exploitation.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify how the Cross Site Scripting (XSS) vulnerability in FluentCMS's TextHTML plugin affects compliance with common standards and regulations such as GDPR or HIPAA.