N/A

CVSS Score

-

CVSS Score

Basic Information

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CVE-2025-56236

CVE-2025-56236: FormCms avatar upload feature has a stored cross-site scripting (XSS) vulnerability

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.

(GitHub Advisory)

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CVE-2025-56236

CVE-2025-56236:

N/A

CVSS Score

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
FormCMS	nuget	< 0.5.7	0.5.7

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The core of the vulnerability lies in the unrestricted file upload capability within the FormCms application, specifically in the user avatar upload feature. The analysis of the security patch commit e078111582e21032c15d4ee7c0867b760fb1161b reveals the exact location of the vulnerability and the fix. The ProfileService.UploadAvatar method was missing a critical file type validation, allowing any file, including HTML with malicious scripts, to be uploaded. The patch adds the IsImage() check to prevent this. The same commit also proactively patches the Add and Replace methods in the AssetService to prevent similar vulnerabilities, indicating a broader pattern of missing file type validation in the application's file upload functionalities. Therefore, ProfileService.UploadAvatar is identified as the primary vulnerable function with high confidence, while the AssetService methods are included as related vulnerable functions with medium confidence.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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