CVE-2025-66301: Grav has Broken Access Control which allows an Editor to modify the page's YAML Frontmatter to alter form processing actions
CVE-2025-66301 · Severity: critical · CVSS 9.6 · Published 2025-12-01
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.
Yes. getgrav/grav (Packagist): upgrade to 1.8.0-beta.27 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-66301?
Check whether you run getgrav/grav (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
getgrav/grav (Packagist): upgrade to 1.8.0-beta.27 or later