{"id":"CVE-2026-91145","title":"Activiti through 7.1.0.M6 fails to validate hash-brace deferred expressions in process variables, allowing attackers to bypass expression filtering","summary":"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 i…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-917"],"vendor":"Activiti","product":"Activiti","affected":["Activiti <= 7.1.0.M6"],"published":"2026-09-14","updated":"2026-09-15","sourceUpdated":"2026-09-15T14:17:46.553","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91145","references":[{"url":"https://github.com/Activiti/Activiti","label":"disclosure@vulncheck.com"},{"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","label":"disclosure@vulncheck.com"},{"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","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Activiti/Activiti/issues/5438","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task","label":"disclosure@vulncheck.com"},{"url":"https://github.com/Activiti/Activiti/issues/5438","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T13:37:15.686978Z"},"epss":0.00242,"epssPercentile":0.15722,"ingestedAt":"2026-09-14T22:16:09.894Z","slug":"CVE-2026-91145","body":"## Overview\n\nActiviti 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":203645,"id":"CVE-2026-91145","ts":1789483132391,"field":"exploit_available","old":"false","new":"true"}]}