{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d"
            }
          ],
          "repo": "https://github.com/flextype/flextype",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-1336",
      "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77939.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "last_affected": "1.0.0-dev"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Flextype CMS through v1.0.0-dev contains an expression language injection vulnerability that allows authenticated attackers with a valid API token to read arbitrary files by passing unsanitized user-supplied input to the Symfony ExpressionLanguage engine via the POST /api/v1/query endpoint. Attackers can leverage exposed application objects including filesystem() and serializers() within the evaluation scope to read arbitrary server files and achieve conditional remote code execution if a PHP file can be placed on disk through a secondary vector.",
  "id": "CVE-2026-77939",
  "modified": "2026-10-08T02:30:36.425833769Z",
  "published": "2026-08-28T17:06:51.132Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77939.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77939"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/flextype-cms-dev-rce-via-post-api-v1-query-endpoint"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/flextype/flextype/issues/595"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/flextype/flextype"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint"
}