{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.21.1"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "redaxo/source"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.21.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-63000"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-352"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-23T14:09:15Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe `rex_api_install_package_update` API function (`install` addon) does not override `requiresCsrfProtection()`, which defaults to `false` in the base class `rex_api_function`. Any authenticated admin can therefore be tricked via a CSRF attack into silently triggering a package update from the REDAXO package server.\n\n### Details\n**File:** `redaxo/src/core/lib/api_function.php:277-280`\n```php\nprotected function requiresCsrfProtection()\n{\n    return false;  // DEFAULT \u2014 subclasses must opt in\n}\n```\n\n**File:** `redaxo/src/addons/install/lib/api/api_package_update.php:8-39`\n```php\nclass rex_api_install_package_update extends rex_api_function\n{\n    public function execute()\n    {\n        if (!rex::getUser()?-\u003eisAdmin()) {\n            throw new rex_api_exception(\u0027You do not have the permission!\u0027);\n        }\n        $addonkey = rex_request(\u0027addonkey\u0027, \u0027string\u0027);\n        $fileId = rex_request(\u0027file\u0027, \u0027int\u0027);\n        $installer = new rex_install_package_update();\n        // ... downloads and installs $addonkey version $fileId from redaxo.org\n    }\n    // requiresCsrfProtection() NOT overridden \u2014 defaults to false\n}\n```\n\nFor comparison, `rex_api_install_package_add` and `rex_api_install_package_delete` both correctly return `true`. Only `rex_api_install_package_update` is missing this.\n\n### PoC\n```html\n\u003c!-- Attacker-controlled page --\u003e\n\u003cimg src=\"https://victim-redaxo.example.com/index.php?page=install/packages\u0026rex-api-call=install_package_update\u0026addonkey=some_addon\u0026file=42\" /\u003e\n```\nWhen an authenticated admin visits this page, the request is automatically made with their session cookie, causing `some_addon` to be updated to version `file_id=42`.\n\n### Impact\nAn attacker who can lure an admin to a malicious page can force-install specific addon versions. If combined with a supply-chain compromise of a package on redaxo.org, or by targeting a downgrade to a known-vulnerable version, this becomes a remote code execution vector. Even without supply-chain compromise, it can be used to disrupt the site by forcing unwanted updates.\n\n### Fix\nAdd `requiresCsrfProtection()` to `rex_api_install_package_update`:\n```php\nprotected function requiresCsrfProtection()\n{\n    return true;\n}\n```",
  "id": "GHSA-m8r3-22v6-g877",
  "modified": "2026-09-23T14:09:15Z",
  "published": "2026-09-23T14:09:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/redaxo/core/security/advisories/GHSA-m8r3-22v6-g877"
    },
    {
      "type": "WEB",
      "url": "https://github.com/redaxo/core/pull/6579"
    },
    {
      "type": "WEB",
      "url": "https://github.com/redaxo/core/commit/a13abbffbad4fdea46a4edc86cdba3335ca9e8f3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/redaxo/core"
    },
    {
      "type": "WEB",
      "url": "https://github.com/redaxo/core/releases/tag/5.21.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "REDAXO: Missing CSRF Protection on Package Update Action Allows Forced Addon Updates"
}