# CVE-2026-38947: FluentCMS TextHTML plugin Cross-Site Scripting in page preview

Source: https://junglewise.ai/threats/cve-2026-38947-fluentcms-texthtml-plugin-cross-site-scripting-in-page-preview  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-05. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-38947 · Severity: medium · CVSS 6.1 · Published 2026-05-05

FluentCMS, a content management system, contains a security flaw in its TextHTML plugin. This vulnerability allows an attacker to inject malicious scripts into web pages. If a user views a compromised page, the attacker could steal login session information or perform unauthorized actions on the user's behalf.

Technologies: [Fluentcms](https://junglewise.ai/threats/technologies/fluentcms). Vendors: [Fluentcms](https://junglewise.ai/threats/vendors/fluentcms).

## Quick answers

**Is CVE-2026-38947 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-38947 being exploited in the wild.

**How severe is CVE-2026-38947?** Medium severity, with a CVSS score of 6.1, published 5 May 2026.

**Which products and versions are affected?** Fluentcms 1.2.3.

**Is there a fix for CVE-2026-38947?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-38947 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-38947?** Check whether you run Fluentcms at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Cross-Site Scripting (XSS) vulnerability exists in FluentCMS 1.2.3 within the TextHTML plugin, specifically affecting the /pagepreview functionality. The root cause is improper neutralization of user-supplied input before it is rendered in the HTTP response (CWE-79). An attacker can exploit this by accessing the page preview mode, selecting the TextHTML plugin, and injecting a malicious payload via the edit menu. The attack requires a user to interact with the crafted content (UI:R) but does not require prior authentication (PR:N). Successful exploitation allows for arbitrary JavaScript execution in the context of the victim's browser session.

## Affected products

- FluentCMS FluentCMS 1.2.3

## Timeline

- 2026-03-02: disclosed: Issue reported on GitHub repository
- 2026-05-05: advisory: CVE published to NVD

## References

- [https://github.com/fluentcms/FluentCMS/issues/2405](https://github.com/fluentcms/FluentCMS/issues/2405)

## Related threats

- [FluentCMS cross-tenant authorization bypass in PermissionManager](https://junglewise.ai/threats/cve-2026-86271-fluentcms-cross-tenant-authorization-bypass-in-permissionmanager)
- [FluentCMS stored XSS in Blocks Plugin](https://junglewise.ai/threats/cve-2026-11434-fluentcms-stored-xss-in-blocks-plugin)
- [FluentCMS stored XSS via SVG upload in File Management](https://junglewise.ai/threats/cve-2025-70842-fluentcms-stored-xss-via-svg-upload-in-file-management)
- [FluentCMS stored XSS via SVG upload in File Management](https://junglewise.ai/threats/cve-2025-15549-fluentcms-stored-xss-via-svg-upload-in-file-management)
- [A cross-site scripting (XSS) vulnerability was identified in FluentCMS 1.2.3. After logging in as an admin and navigating to the "Add Page"](https://junglewise.ai/threats/cve-2025-67349-a-cross-site-scripting-xss-vulnerability-was-identified-in)