Apache Syncope: Remote Code Execution via Flowable BPMN Groovy ScriptTask

{
  "id": "6b48d90c80d5ebe110ce7416fb91968e95234f276b9f07c607bd7475de07bac8",
  "url": "https://osv.dev/vulnerability/CVE-2026-53405",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache Syncope: Remote Code Execution via Flowable BPMN Groovy ScriptTask",
    "summary": "Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements can import arbitrary BPMN process definitions via the REST API and then start the process. When a BPMN process containing a Groovy scriptTask is imported and started, the Groovy script is executed directly on the server, with no sandbox. This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.6, from 4.1.0-M0 through 4.1.1. Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by wrapping Flowable's Groovy scriptTasks with security sandbox.",
    "evidence": "osv:CVE-2026-53405",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-53405",
      "aliases": [
        "CVE-2026-53405"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/syncope",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d4a8b1eb53b246c42acb757739637be02838a082"
                },
                {
                  "last_affected": "2b741bd0d6b4f49779a0c01cad597c6a15f93351"
                },
                {
                  "introduced": "b0c019c1256bf433bf60e3211ee8711dae03e6bc"
                },
                {
                  "fixed": "84abc48d024599ca49ef07b726e698206120ffd9"
                },
                {
                  "introduced": "7afe57a317c88ebedf75ca8d714ad743e5cd1d24"
                },
                {
                  "fixed": "1607ab1fff8542e6fdd634ff68b9afd03d80dd8c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "last_affected": "3.0.16"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.0.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.1.0"
                      },
                      {
                        "fixed": "4.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "syncope-4.0.6",
            "syncope-4.0.5",
            "syncope-4.1.0",
            "syncope-3.0.16",
            "syncope-4.0.4",
            "syncope-3.0.15",
            "syncope-4.0.3",
            "syncope-3.0.14",
            "syncope-4.0.2",
            "syncope-3.0.13",
            "syncope-4.0.1",
            "syncope-3.0.12",
            "syncope-4.0.0",
            "syncope-3.0.11",
            "syncope-3.0.10",
            "syncope-3.0.9",
            "syncope-3.0.8",
            "syncope-3.0.7",
            "syncope-3.0.6",
            "syncope-3.0.5",
            "syncope-3.0.4",
            "syncope-3.0.3",
            "syncope-3.0.2",
            "syncope-3.0.1",
            "syncope-3.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53405.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.617434941Z",
      "provider": "osv",
      "references": [
        "https://repo.maven.apache.org/maven2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53405.json",
        "https://lists.apache.org/thread/vdq0tk6ylffz6trbgbllj9kb1ndzff7k",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53405"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-653"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.0.0-M0"
                  },
                  {
                    "last_affected": "3.0.16"
                  },
                  {
                    "introduced": "4.0.0-M0"
                  },
                  {
                    "last_affected": "4.0.6"
                  },
                  {
                    "introduced": "4.1.0-M0"
                  },
                  {
                    "last_affected": "4.1.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53405.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53405",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521451,
  "published_at": "2026-07-20T14:20:06.824+00:00"
}