Vulnerabilities in pkg:nuget/FormCMS

PACKAGE
Advisory Identifier: GHSA-6cwx-42hw-w69c
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Advisory Summary

CVE-2025-55797 is a MODERATE formcms has an improper access vulnerability (CWE-284: Improper Access Control) affecting FormCMS libraries in the NuGet ecosystem. The issue involves formcms has an improper access control vulnerability in the /api/schemas/history/[schemaid] endpoint. Remediation is available by upgrading affected packages to version 0.5.5.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:nuget/FormCMS

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:nuget/FormCMS. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-6cwx-42hw-w69c CVE-2025-55797 MODERATE FormCMS has an improper access control vulnerability in the /api/schemas/history/[schemaId] endpoint
GHSA-4fxf-xgrm-8fcj CVE-2025-56236 MODERATE FormCms avatar upload feature has a stored cross-site scripting (XSS) vulnerability

CVE-2025-55797 at a Glance

CVE Identifier CVE-2025-55797
GHSA Identifier GHSA-6cwx-42hw-w69c
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-284: Improper Access Control
Affected Product FormCMS
Package Ecosystem NuGet
Published Date
Last Updated

How to Fix CVE-2025-55797

To remediate this vulnerability, upgrade all affected FormCMS dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

FormCMS fixed: 0.5.5 
Upgrade FormCMS to 0.5.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for FormCMS

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-55797, inspect your project dependencies for FormCMS:

inspect dependencies for FormCMS

Analyze the terminal output to locate any version of FormCMS in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.5), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In FormCMS, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An improper access control vulnerability in FormCms v0.5.4 in the /api/schemas/history/[schemaId] endpoint allows unauthenticated attackers to access historical schema data if a valid schemaId is known or guessed.

CVE-2025-55797 Affected FormCMS Versions

1 component(s)
Fixed Versions:
0.5.5
Product / Package Ecosystem Affected Versions Fixed Version
FormCMS
nuget/FormCMS
NuGet
< 0.5.5
0.5.5

References

NVD — CVE-2025-55797 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-55797
FormCMS Source Repository REPOSITORY
https://github.com/formcms/formcms/issues/19
FormCMS Source Repository REPOSITORY
https://github.com/FormCms
FormCMS Source Repository REPOSITORY
https://github.com/FormCms/FormCms
FormCMS Source Repository REPOSITORY
https://github.com/KKC73/me/tree/main/CVE-2025-55797

Frequently Asked Questions

What is CVE-2025-55797?
CVE-2025-55797 is a security vulnerability in FormCMS involving FormCMS has an improper access control vulnerability in the /api/schemas/history/[schemaId] endpoint under CWE-284: Improper Access Control.
Which FormCMS versions are affected?
Affected versions include releases prior to 0.5.5 across affected packages: FormCMS.
What version fixes CVE-2025-55797?
Upgrading to 0.5.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is FormCMS affected?
Yes, FormCMS is affected in releases prior to 0.5.5. Upgrade your dependency to 0.5.5 or later.
What CWE is associated with CVE-2025-55797?
CVE-2025-55797 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check NuGet dependencies for CVE-2025-55797?
Run the dependency tree command: 'inspect dependencies for FormCMS'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6cwx-42hw-w69c",
  "modified" : "2025-09-30T21:50:52Z",
  "published" : "2025-09-30T18:30:24Z",
  "aliases" : [ "CVE-2025-55797" ],
  "summary" : "FormCMS has an improper access control vulnerability in the /api/schemas/history/[schemaId] endpoint",
  "details" : "An improper access control vulnerability in FormCms v0.5.4 in the /api/schemas/history/[schemaId] endpoint allows unauthenticated attackers to access historical schema data if a valid schemaId is known or guessed.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "FormCMS"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.5.4"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-55797"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/formcms/formcms/issues/19"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FormCms"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/FormCms/FormCms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/KKC73/me/tree/main/CVE-2025-55797"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-284" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-30T21:50:52Z",
    "nvd_published_at" : "2025-09-30T16:15:52Z"
  }
}