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getgrav/grav-plugin-form

Open actionable advisories and recorded vendor fixes. This public package view has no inventory attached and cannot establish whether your deployment is affected. A vendor fix never resolves your finding; verify your installed version and the source guidance.

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. High, CVSS 7.7PackagistPublished

    Grav Form Plugin has an Anonymous Page Content Overwrite via Form File Upload filename Override

    CVE-2026-42845 · GHSA-w4rc-p66m-x6qq

    Affected
    • Packagist getgrav/grav-plugin-form < 9.1.0
    Fixed in
    9.1.0· Vendor fix available
    Issue
    (Tested on Form 9.0.3 released on April, 28th) The Form plugin's file upload handler at user/plugins/form/classes/Form.php:583 accepts a POST-supplied filename parameter ($filename = $post['filename'] ?? $upload['file']['name']) that overrides the original uploaded filename. The override passes through Utils::checkFilename(), which blocks only a narrow extension list (.php, .htm, .js, .exe). Markdown (.md) is not blocked. A page's directory under user/pages/ contains its .md content file (e.g. default.md, form.md). When a form's file upload field has accept: [''] (or any policy that admits text files), an unauthenticated visitor can: 1. Upload arbitrary content with filename=form.md (or other page-content filenames), 2. Submit the form to trigger Form::copyFiles(), which overwrites the page's own .md file. Details Vulnerable code path user/plugins/form/classes/Form.php:580-606 (in uploadFiles()): Utils::checkFilename() (system/src/Grav/Common/Utils.php:980) blocks ..,…

    Recommended action: Upgrade to 9.1.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:github.comSource checked Evidence →