GitHub Advisoryadvisory · NuGet

GHSA-4fxf-xgrm-8fcj FormCms avatar upload feature has a stored cross-site scripting (XSS) vulnerability

MEDIUM Published 2025-08-28 Modified 2025-08-28 Official page ↗
Aliases
CVE-2025-56236
Ecosystem
NuGet
Packages
FormCMS
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weaknesses
CWE-434, CWE-79
Reviewed
2025-08-28

Affected packages

• NuGet FormCMS: < 0.5.7 → fixed in 0.5.7

Description

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.

Related

Alias · CVE (1)

  • CVE-2025-56236 FormCms v0.5.5 contains a stored cross-site scripting (XSS) vulnerability in the avatar upload feature. vulnerability

Weakness · CWE (2)

  • CWE-434 Unrestricted Upload of File with Dangerous Type weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References