Vulnerability · Published Aug 28, 2025 · Assigned by mitre

CVE-2025-56236

Medium 6.1

In plain English

A medium-severity cross-site scripting in the formcms package (NuGet). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.2%top 89.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
NuGet	formcms	0.5.7	GHSA-4fxf-xgrm-8fcj

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

In plain English

Official description

Affected packages & fixed versions

Affected products (as reported)

References