---
id: CVE-2025-56236
title: >-
  FormCms v0.5.5 contains a stored cross-site scripting (XSS) vulnerability in
  the avatar upload feature
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 …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: formcms
product: formcms
affected:
  - 'formcms >= 0.5.5, < 0.5.7'
patched:
  - formcms 0.5.7
published: '2025-08-28'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-56236'
references:
  - url: 'https://github.com/FormCms/FormCms/issues/27'
    label: cve@mitre.org
  - url: 'https://github.com/KKC73/me/blob/main/CVE-2025-56236/README.md'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00212
epssPercentile: 0.10273
ingestedAt: '2026-09-26T00:22:39.886Z'
---

## Overview

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

- `formcms >= 0.5.5, < 0.5.7`

## Remediation

Upgrade past the affected range:

- `formcms 0.5.7`