GHSA-4fxf-xgrm-8fcj

FormCms avatar upload feature has a stored cross-site scripting (XSS) vulnerability

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-56236

Packages

Ecosystem	Package	Affected	Fixed in
NuGet	FormCMS	< 0.5.7	0.5.7

Details

As written in the advisory (Markdown source, shown as plain text).

FormCms v0.5.5 contains a stored cross-site scripting (XSS) vulnerability in the avatar upload feature. Authenticated users can upload .html files containing malicious JavaScript, which are accessible via a public URL. When a privileged user accesses the file, the script executes in their browser context.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2025-56236 advisory
https://github.com/FormCms/FormCms/issues/27 web
https://github.com/KKC73/me/blob/main/CVE-2025-56236/README.md web
https://github.com/formcms/formcms package