CVE-2026-42845
CVE-2026-42845 · Grav: Anonymous Page Content Overwrite via Form File Upload filename Override
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.7 · High · EPSS 0.7% · Fix available
- Published
- Updated
Stack: php
Affected products and versions
grav-plugin-form
- Versions
- < 9.1.0: Affected
No fix published
getgrav/grav-plugin-form Packagist
- Affected ranges
- ECOSYSTEM: < 9.1.0
Update to 9.1.0