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      <title>CVE-2026-42845 — Grav: Anonymous Page Content Overwrite via Form File Upload filename Override</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-42845</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; getgrav grav-plugin-form&lt;/p&gt;
&lt;p&gt;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&amp;#39;s own `.md` and pivot to super-admin via a `process: save` action. This vulnerability is fixed in 9.1.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; getgrav grav-plugin-form&lt;/p&gt;
&lt;p&gt;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&amp;#39;s own `.md` and pivot to super-admin via a `process: save` action. This vulnerability is fixed in 9.1.0.&lt;/p&gt;</content:encoded>
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