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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | FormCMS | < 0.5.7 | 0.5.7 |
References
- CVSS vector
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- Weakness (CWE)
CWE-434, CWE-79- Platform
- .NET (NuGet)
- Package
FormCMS- Disclosed
- 28.08.2025
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-4fxf-xgrm-8fcj - CC BY 4.0
Vulnerability history: FormCMS
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 08.2025 09.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
Disclosures per year
- 2025: 2
- 2026: 0
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FormCms avatar upload feature has a stored cross-site scripting (XSS) vulnerability this entry
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