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CVE-2025-56236

Good to know:

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Date: August 27, 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.

Severity Score

Related Resources (5)

https://github.com/KKC73/me/blob/main/CVE-2025-56236/README.md
https://github.com/formcms/formcms
https://nvd.nist.gov/vuln/detail/CVE-2025-56236
https://github.com/FormCms/FormCms/issues/27
https://www.mend.io/vulnerability-database/CVE-2025-56236

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Unrestricted Upload of File with Dangerous Type

CWE-434

Top Fix

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Upgrade Version

Upgrade to version formcms - 0.5.7

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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