CVE-2026-40098: OpenMage LTS Cross-user Wishlist Import Leads To Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-665x-ppc4-685w",
  "modified" : "2026-04-27T16:31:43Z",
  "published" : "2026-04-21T15:20:41Z",
  "aliases" : [ "CVE-2026-40098" ],
  "summary" : "OpenMage LTS: Cross-user wishlist import leads to private option & file disclosure",
  "details" : "# Cross-user wishlist item import via shared wishlist code, leading to private option disclosure and file-disclosure variant\n\n## Summary\n\nThe shared wishlist add-to-cart endpoint authorizes access with a public `sharing_code`, but loads the acted-on wishlist item by a separate global `wishlist_item_id` and never verifies that the item belongs to the shared wishlist referenced by that code.\n\nThis lets an attacker use:\n\n- a valid shared wishlist code for wishlist A\n- a wishlist item ID belonging to victim wishlist B\n\nto import victim item B into the attacker's cart through the shared wishlist flow for wishlist A.\n\nBecause the victim item's stored `buyRequest` is reused during cart import, the victim's private custom-option data is copied into the attacker's quote. If the product uses a file custom option, this can be elevated to cross-user file disclosure because the imported file metadata is preserved and the download endpoint is not ownership-bound.\n\n## Vulnerability Type\n\n- Broken object-level authorization / IDOR\n- Cross-user data disclosure\n- Cross-user file disclosure variant\n\n## Root Cause\n\nIn `app/code/core/Mage/Wishlist/controllers/SharedController.php`, the shared flow does:\n\n```php\n$item = Mage::getModel('wishlist/item')->load($itemId);\n$wishlist = Mage::getModel('wishlist/wishlist')->loadByCode($code);\n...\n$item->addToCart($cart);\n```\n\nRelevant lines:\n\n- `SharedController.php:86` loads the wishlist item by global ID\n- `SharedController.php:87` loads the wishlist by shared code\n- `SharedController.php:99` imports the item into cart\n\nThere is no check that:\n\n```php\n$item->getWishlistId() == $wishlist->getId()\n```\n\nThe safe owner flow in `app/code/core/Mage/Wishlist/controllers/IndexController.php:521-528` does preserve this binding by deriving the wishlist from `item->getWishlistId()`.\n\nThe imported item keeps its original `buyRequest` because `app/code/core/Mage/Wishlist/Model/Item.php:370-372` passes that stored request directly into:\n\n```php\n$cart->addProduct($product, $buyRequest);\n```\n\n## Security Impact\n\n### Baseline impact\n\nAn attacker can import another user's private wishlist item into the attacker's own cart, using an unrelated shared wishlist code.\n\nThis is a clear cross-user authorization bypass. The victim item's private configuration is copied into the attacker's quote, including custom-option values such as personalized text.\n\n### Stronger variant: cross-user file disclosure\n\nIf the victim item contains a custom option of type `file`, the imported quote item preserves file metadata such as:\n\n- `quote_path`\n- `order_path`\n- `secret_key`\n\nThe file option renderer in `app/code/core/Mage/Catalog/Model/Product/Option/Type/File.php:547-552` generates a download URL from:\n\n- the imported `sales/quote_item_option` ID\n- the preserved `secret_key`\n\nThe downloader in `app/code/core/Mage/Sales/controllers/DownloadController.php:150-185`:\n\n- loads quote item option by global ID\n- verifies only product option type and `secret_key`\n- reads the file from `order_path` or `quote_path`\n\nIt does not verify ownership of the quote item, order, or original wishlist item. This creates a cross-user file disclosure path once victim file metadata has been imported.\n\n## Steps To Reproduce\n\n### Lab data\n\n- shared wishlist A:\n  - `wishlist_id = 1`\n  - `customer_id = 2`\n  - `sharing_code = 6376bb8c37a09c2de3664bd8cdc16412`\n- victim wishlist B:\n  - `wishlist_id = 2`\n  - `customer_id = 3`\n- victim item:\n  - `wishlist_item_id = 1`\n  - `wishlist_id = 2`\n  - `product_id = 2`\n- victim private text option marker:\n  - `VICTIM-MARKER-49040822`\n\n### Reproduction\n\nSend:\n\n```http\nGET /wishlist/shared/cart/?code=6376bb8c37a09c2de3664bd8cdc16412&item=1\n```\n\nWhere:\n\n- `code` belongs to shared wishlist A\n- `item=1` belongs to victim wishlist B\n\n### Expected result\n\nThe request should be rejected because the item does not belong to the shared wishlist referenced by the `sharing_code`.\n\n### Actual result\n\nThe application imports victim item `1` into the attacker's quote anyway.\n\n## Verified Evidence\n\n### Baseline variant\n\nPreviously verified at quote/option level in lab:\n\n```text\noption_1 = VICTIM-MARKER-49040822\n```\n\nThis shows that the attacker's cart received victim-private custom-option data from another user's wishlist item.\n\n### File-disclosure variant\n\nPreviously verified in lab after importing a victim file-option payload:\n\n```text\n/sales/download/downloadCustomOption/id/9/key/86fca9b61c0b891b52fb/\n```\n\nThis URL was generated from imported quote item option data containing the victim file metadata and secret key.\n\n## Why This Is A Valid Bug\n\nThis is not a timing issue and does not depend on non-default security settings.\n\nThe bug is a direct authorization failure:\n\n- authorization is based on wishlist A's share code\n- the acted-on object is item B from another wishlist\n- there is no item-to-wishlist binding check\n- victim-controlled item state is then copied into attacker-controlled cart state\n\nThat is a broken object-level authorization issue with clear cross-user impact.\n\n## Remediation\n\nIn `SharedController::cartAction()`, reject any request where the loaded item does not belong to the wishlist loaded from the share code:\n\n```php\n$item = Mage::getModel('wishlist/item')->load($itemId);\n$wishlist = Mage::getModel('wishlist/wishlist')->loadByCode($code);\n\nif (!$item->getId() || !$wishlist->getId() || (int) $item->getWishlistId() !== (int) $wishlist->getId()) {\n    return $this->_forward('noRoute');\n}\n```\n\nDefense in depth:\n\n- bind `sales/download/downloadCustomOption` to the current quote/order owner instead of trusting only `id + secret_key`",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "openmage/magento-lts"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "20.17.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/OpenMage/magento-lts/security/advisories/GHSA-665x-ppc4-685w"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40098"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OpenMage/magento-lts/pull/5446"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/OpenMage/magento-lts"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OpenMage/magento-lts/releases/tag/v20.17.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-21T15:20:41Z",
    "nvd_published_at" : "2026-04-20T17:16:34Z"
  }
}