CVE-2026-54159: prestashop/ps_facetedsearch Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-m5f5-28qr-9g9r",
  "modified" : "2026-07-10T20:36:56Z",
  "published" : "2026-07-10T20:36:56Z",
  "aliases" : [ "CVE-2026-54159" ],
  "summary" : "prestashop/ps_facetedsearch: PHP Object Injection in faceted search cache allows unauthenticated RCE",
  "details" : "### Impact\n\nA PHP Object Injection vulnerability affects the PrestaShop module `ps_facetedsearch`.\n\nThe module rebuilds the selected search filters from the request URL. The value of a slider filter (**price** or **weight**) is taken from the URL without sufficient validation, then stored in an internal filter-block cache where it is serialized and later read back with a raw native `unserialize()`.\nBy crafting that value, an attacker can smuggle a malicious serialized PHP object into the cache. When it is deserialized, a gadget chain writes an arbitrary PHP file inside the module directory, which is then used as a webshell to run commands on the server.\n\n### Who is impacted\n\nAny shop using a vulnerable version of `ps_facetedsearch` that displays a filter template containing a slider filter (price or weight). Exploitation is remote and **unauthenticated**, a single crafted front-office request is enough, and leads to remote code\nexecution and full compromise of the shop and its server.\n\n**Affected versions:** `3.0.0` through `4.0.3` (all versions since 3.0.0, including the latest release).\n\n\n### Patches\n\nUpgrade the `ps_facetedsearch` module to the patched version. Upgrading the module is the best action that removes the vulnerability.\n\nOtherwise, you can apply the fix manually in the file `src/Filters/Block.php`:\n\nIn the `getFromCache()` method, replace the native `unserialize()` call:\n\n```php\n// Before\nif (!empty($row)) {\n    return unserialize(current($row));\n}\n\n// After\nif (!empty($row)) {\n    return \\Tools::unSerialize(current($row));\n}\n```\n\n### Until the module is upgraded:\n\n- Remove price and weight slider filters from the filter templates that are exposed on the\n  front office.\n- Clear the faceted-search filter cache, and audit the `modules/ps_facetedsearch/` directory for\n  unexpected PHP files.\n- Monitor search requests for PHP serialization patterns (`O:`, `;i:`, references to classes such\n  as `Monolog\\…`) and block them at the WAF level.\n\n### Resources\n\n- Thank you to Frédéric Moreau (Antadis) and Gilles Caudal (Datalinx) for reporting this vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "prestashop/ps_facetedsearch"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "4.0.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/PrestaShop/ps_facetedsearch/security/advisories/GHSA-m5f5-28qr-9g9r"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/PrestaShop/ps_facetedsearch"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-10T20:36:56Z",
    "nvd_published_at" : null
  }
}