{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "7.1.0.M6"
              },
              {
                "fixed": "7.1.0.M6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "22d8f121451e049ea84a726064162b60d9b3aa69"
            }
          ],
          "repo": "https://github.com/activiti/activiti",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-917"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91145.json"
  },
  "details": "Activiti through 7.1.0.M6 fails to validate hash-brace deferred expressions in process variables, allowing attackers to bypass expression filtering. Attackers can inject expressions beginning with #{ that are stored and later evaluated in the full Spring context when a mail task uses variable-backed body fields, enabling method invocation on application beans.",
  "id": "CVE-2026-91145",
  "modified": "2026-09-17T03:30:34.573028422Z",
  "published": "2026-09-14T21:45:45.317Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91145.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91145"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Activiti/Activiti/issues/5438"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Activiti/Activiti"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/Activiti/Activiti/blob/7.1.0.M6/activiti-core/activiti-api-impl/activiti-api-process-runtime-impl/src/main/java/org/activiti/runtime/api/impl/ExpressionResolver.java"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/Activiti/Activiti/blob/7.1.0.M6/activiti-core/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/MailActivityBehavior.java"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Activiti through 7.1.0.M6 Expression Injection via Mail Task"
}