{"id":"GHSA-m8r3-22v6-g877","aliases":["CVE-2026-63000"],"title":"REDAXO: Missing CSRF Protection on Package Update Action Allows Forced Addon Updates","description":"### 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 — 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()?->isAdmin()) {\n            throw new rex_api_exception('You do not have the permission!');\n        }\n        $addonkey = rex_request('addonkey', 'string');\n        $fileId = rex_request('file', 'int');\n        $installer = new rex_install_package_update();\n        // ... downloads and installs $addonkey version $fileId from redaxo.org\n    }\n    // requiresCsrfProtection() NOT overridden — 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<!-- Attacker-controlled page -->\n<img src=\"https://victim-redaxo.example.com/index.php?page=install/packages&rex-api-call=install_package_update&addonkey=some_addon&file=42\" />\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```","severity":"medium","score":6.4,"published":"2026-09-23T14:09:15.000Z","modified":"2026-09-23T14:15:04.604Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"redaxo/source","ranges":[{"events":[{"introduced":"0"},{"fixed":"5.21.2"}],"type":"ECOSYSTEM"}],"versions":["5.10.0","5.10.0-beta1","5.10.0-beta2","5.10.1","5.11.0","5.11.0-beta1","5.11.1","5.11.2","5.12.0","5.12.0-beta1","5.12.0-beta2","5.12.0-beta3","5.12.1","5.13.0","5.13.0-beta1","5.13.0-beta2","5.13.1","5.13.2","5.13.3","5.14.0","5.14.0-beta1","5.14.0-beta2","5.14.1","5.14.2","5.14.3","5.15.0","5.15.0-beta1","5.15.1","5.16.0","5.16.0-beta1","5.16.1","5.17.0","5.17.1","5.18.0","5.18.1","5.18.2","5.18.3","5.19.0","5.20.0","5.20.1","5.20.2","5.21.0","5.21.0-beta1","5.21.1"],"fixed":["5.21.2"]}],"sourceAffected":[],"references":["https://github.com/redaxo/core/security/advisories/GHSA-m8r3-22v6-g877","https://github.com/redaxo/core/pull/6579","https://github.com/redaxo/core/commit/a13abbffbad4fdea46a4edc86cdba3335ca9e8f3","https://github.com/redaxo/core","https://github.com/redaxo/core/releases/tag/5.21.2"],"sources":[{"name":"OSV","id":"GHSA-m8r3-22v6-g877","modified":"2026-09-23T14:15:04.604291726Z","url":"https://osv.dev/vulnerability/GHSA-m8r3-22v6-g877"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L","score":6.4}]}