Vulnerability DatabaseCVE-2025-56236
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CVE-2025-56236
August 28, 2025
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.
Affected Packages
FormCMS (NUGET):
Affected version(s) >=0.3.4 <0.5.7
Fix Suggestion:
Update to version 0.5.7
Related Resources (4)
https://nvd.nist.gov/vuln/detail/CVE-2025-56236
https://github.com/formcms/formcms
https://github.com/KKC73/me/blob/main/CVE-2025-56236/README.md
https://github.com/FormCms/FormCms/issues/27
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Unrestricted Upload of File with Dangerous Type
CWE-434
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79
EPSS
Base Score:
0.03