CVE-2026-42845
HighSummary
The form plugin for Grav adds the ability to create and use forms. Prior to 9.1.0, there was an unauthenticated page-content overwrite via file upload.
Risk Assessment
The organization may be exposed to attacks that allow overwriting page content and gaining access to the super-admin account.
Recommendation
It is recommended to update the plugin to version 9.1.0 to eliminate this vulnerability and block the upload of dangerous files.
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Original NVD description (English source)
The form plugin for Grav adds the ability to create and use forms. Prior to 9.1.0 , there is an unauthenticated page-content overwrite via file upload (GHSA-w4rc-p66m-x6qq). Public form uploads now strip path components from the POST-supplied filename and hard-block page-content extensions (`md`, `yaml`, `yml`, `json`, `twig`, `ini`) regardless of the configurable dangerous-extensions list. A permissive `accept` policy combined with the default `destination: self@` could otherwise let an attacker overwrite the page's own `.md` and pivot to super-admin via a `process: save` action. This vulnerability is fixed in 9.1.0.