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CVE-2025-56236 — Vulnerability in FormCMS — CVE Details

MEDIUM

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

Published August 28, 2025Updated August 28, 2025Source: osv

Summary

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.

Advisory Timeline

  • First published August 28, 2025 (410 days ago).
  • Last revised August 28, 2025 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update FormCMS to 0.5.7 or later
dotnet add package FormCMS --version 0.5.7

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
FormCMS
nuget
0.4.4, 0.4.5, 0.4.6, 0.4.7 (+9 more)0.5.7

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-434
    Unrestricted File UploadMITRE
  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.2 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2025-56236?
FormCms avatar upload feature has a stored cross-site scripting (XSS) vulnerability This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 7.2/10).
How do I check if my project is affected by CVE-2025-56236?
CVE-2025-56236 affects FormCMS. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-56236 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.2

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-4fxf-xgrm-8fcj

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