{"id":"CVE-2026-91145","summary":"Activiti through 7.1.0.M6 Expression Injection via Mail Task","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.","modified":"2026-09-17T03:30:34.573028422Z","published":"2026-09-14T21:45:45.317Z","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"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/activiti/activiti","events":[{"introduced":"0"},{"fixed":"22d8f121451e049ea84a726064162b60d9b3aa69"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"7.1.0.M6"},{"fixed":"7.1.0.M6"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["activiti-7-201709-EA","activiti-7-201708HOTFIX-EA","activiti-7-201708-EA","activiti-6.0.0","activiti-6.0.0.RC1","activiti-6.0.0.Beta4","activiti-6.0.0.Beta3","activiti-6.0.0.Beta2","activiti-5.17.0","activiti-5.16.4","activiti-5.16.3","activiti-5.16.2","activiti-5.16.1","activiti-5.16","activiti-5.15","activiti-5.14","activiti-5.13","activiti-5.12.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91145.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}