ps_facetedsearch: PHP Object Injection in faceted search cache allows unauthenticated RCE

{
  "id": "3b054140a566b749d49fe13d7ca0e4c3a4c6ca6ba02a7451d81c12e55d17d459",
  "url": "https://osv.dev/vulnerability/CVE-2026-54159",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ps_facetedsearch: PHP Object Injection in faceted search cache allows unauthenticated RCE",
    "summary": "PrestaShop ps_facetedsearch is a module that adds layered navigation filters. From 3.0.0 until 4.0.4, the ps_facetedsearch module rebuilds selected search filters from the request URL, and the value of a slider filter, price or weight, is taken from the URL without sufficient validation and stored in an internal filter-block cache where it is serialized and later read back with a raw native unserialize() in src/Filters/Block.php. By crafting that value, an unauthenticated attacker can smuggle a malicious serialized PHP object into the cache, and when it is deserialized, a gadget chain writes an arbitrary PHP file inside the modules/ps_facetedsearch/ directory, which is then used as a webshell to run commands on the server. This issue is fixed in version 4.0.4.",
    "evidence": "osv:CVE-2026-54159",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-54159",
      "aliases": [
        "CVE-2026-54159",
        "GHSA-m5f5-28qr-9g9r"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/prestashop/ps_facetedsearch",
              "type": "GIT",
              "events": [
                {
                  "introduced": "41cbc9f08cc074ec09f736099579aac73c19d7b2"
                },
                {
                  "fixed": "08d80f46ef101389a8128232b1a208142c28a718"
                },
                {
                  "fixed": "9ca839fac68a60641d8187a3ff9730ab09af33cb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "4.0.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9ca839fac68a60641d8187a3ff9730ab09af33cb"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "08d80f46ef101389a8128232b1a208142c28a718"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.0.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.0.3",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v3.16.1",
            "v3.16.0",
            "v3.15.1",
            "v3.15.0",
            "v3.14.1",
            "v3.14.0",
            "v3.13.2",
            "v3.13.1",
            "v3.13.0",
            "v3.12.1",
            "v3.12.0",
            "v3.11.1",
            "v3.11.0",
            "v3.10.0",
            "v3.9.0",
            "v3.8.0",
            "v3.6.0",
            "v3.5.0",
            "v3.4.1",
            "v3.4.0",
            "v3.3.0",
            "untagged-45df9cf520cc07d9bd44",
            "v3.2.1",
            "v3.2.0",
            "v3.1.0",
            "v3.0.7",
            "v3.0.6",
            "v3.0.5",
            "v3.0.4",
            "v3.0.3",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54159.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.050306406Z",
      "provider": "osv",
      "references": [
        "https://github.com/PrestaShop/ps_facetedsearch/releases/tag/v4.0.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54159.json",
        "https://github.com/PrestaShop/ps_facetedsearch/security/advisories/GHSA-m5f5-28qr-9g9r",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54159",
        "https://github.com/PrestaShop/ps_facetedsearch/commit/9ca839fac68a60641d8187a3ff9730ab09af33cb"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-74"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54159.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54159",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517565,
  "published_at": "2026-07-17T20:39:25.838+00:00"
}