Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint

{
  "id": "e27784b216140981364bbeb6f225473af6709a071efeb0b6157e996b5a54e1f1",
  "url": "https://osv.dev/vulnerability/CVE-2026-77939",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint",
    "summary": "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.",
    "evidence": "osv:CVE-2026-77939",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-77939",
      "aliases": [
        "CVE-2026-77939"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flextype/flextype",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.0-alpha.3",
            "v1.0.0-alpha.2",
            "v1.0.0-alpha.1",
            "v0.9.16",
            "v0.9.15",
            "v0.9.14",
            "v0.9.13",
            "v0.9.12",
            "v0.9.11",
            "v0.9.10",
            "v0.9.9",
            "v0.9.8",
            "v0.9.7",
            "v0.9.6",
            "v0.9.5",
            "v0.9.4",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.4",
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77939.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.461791541Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77939.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-77939",
        "https://www.vulncheck.com/advisories/flextype-cms-dev-rce-via-post-api-v1-query-endpoint",
        "https://github.com/flextype/flextype/issues/595",
        "https://github.com/flextype/flextype"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1336",
          "CWE-94"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "1.0.0-dev"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77939.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-77939",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497186,
  "published_at": "2026-08-28T17:06:51.132+00:00"
}