Stored XSS Affecting formcms package, versions [,0.5.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-FORMCMS-12304082
- published2 Sept 2025
- disclosed28 Aug 2025
- creditKuycheu Kung
Introduced: 28 Aug 2025
NewCVE-2025-56236 (opens in a new tab)How to fix?
Upgrade FormCMS to version 0.5.7 or higher.
Overview
FormCMS is a FormCMS is an open-source Content Management System designed to simplify and accelerate web development workflows for CMS projects and general web applications. It streamlines data modeling, backend development, and frontend design, making them as intuitive as filling out a form. With a focus on fostering user engagement, FormCMS provides robust social features alongside powerful tools for data management, API development, and dynamic page creation.
Affected versions of this package are vulnerable to Stored XSS via the /api/profile/avatar endpoint. An attacker who can convince a user to follow a link to a public URL can execute arbitrary JavaScript code in the browser of privileged users by uploading a malicious .html file.