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.
History

Tue, 12 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 12 May 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Getgrav
Getgrav grav-plugin-form
Vendors & Products Getgrav
Getgrav grav-plugin-form

Mon, 11 May 2026 16:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Grav: Anonymous Page Content Overwrite via Form File Upload filename Override
Weaknesses CWE-73
References
Metrics cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-05-11T15:44:35.524Z

Updated: 2026-05-12T13:49:49.704Z

Reserved: 2026-04-30T16:44:48.377Z

Link: CVE-2026-42845

cve-icon Vulnrichment

Updated: 2026-05-12T13:49:33.409Z

cve-icon NVD

Status : Deferred

Published: 2026-05-11T17:16:34.157

Modified: 2026-05-12T14:51:21.830

Link: CVE-2026-42845

cve-icon Redhat

No data.