Is CVE-2025-70842 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-70842 being exploited in the wild.

How severe is CVE-2025-70842?

Medium severity, with a CVSS score of 5.4, published 12 May 2026.

Is there a fix for CVE-2025-70842?

A patch was published on 2026-03-30: Pull request #2407 created to address the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2025-70842 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2025-70842?

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.

CVE-2025-70842: FluentCMS stored XSS via SVG upload in File Management

CVE-2025-70842 · Severity: medium · CVSS 5.4 · Published 2026-05-12

FluentCMS is a content management system used to build and manage websites. A security flaw in its file management system allows users with administrative access to upload malicious image files (SVGs) containing hidden scripts. If a visitor or another administrator views the direct link to one of these images, the hidden script will run in their browser, potentially allowing an attacker to hijack sessions, redirect users to malicious sites, or perform unauthorized actions.

Technologies: Fluentcms. Vendors: Fluentcms.

Quick answers

Is CVE-2025-70842 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2025-70842 being exploited in the wild.
How severe is CVE-2025-70842?: Medium severity, with a CVSS score of 5.4, published 12 May 2026.
Which products and versions are affected?: Fluentcms 1.2.3.
Is there a fix for CVE-2025-70842?: A patch was published on 2026-03-30: Pull request #2407 created to address the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-70842 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2025-70842?: 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 stored cross-site scripting (XSS) vulnerability exists in the File Management module of FluentCMS version 1.2.3. The application fails to sanitize SVG files during the upload process, allowing authenticated administrators to embed malicious JavaScript within SVG elements or event handlers (e.g., <script> tags or 'onload' attributes). Because these files are stored in a public directory and served without restrictive security headers, the payload executes in the context of any user—including unauthenticated visitors—who navigates to the direct URL of the uploaded file. A fix has been proposed in pull request #2407 which introduces server-side SVG sanitization using System.Xml.Linq to strip dangerous elements and attributes.

Affected products

FluentCMS FluentCMS 1.2.3

Timeline

2026-01-01: disclosed: Issue reported on GitHub by jaroslaw-wawiorko
2026-03-30: patched: Pull request #2407 created to address the vulnerability
2026-05-12: advisory: CVE-2025-70842 published

References

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