{"id":"CVE-2026-91145","state":"PUBLISHED","title":"Activiti through 7.1.0.M6 Expression Injection via Mail Task","description":"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.","publishedAt":"2026-09-14T21:45:45.317Z","updatedAt":"2026-09-24T14:22:12.311Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["Activiti Activiti"],"affected":[{"vendor":"Activiti","product":"Activiti","packageURL":"pkg:maven/org.activiti/activiti-engine","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.1.0.M6","versionType":"custom"}],"repo":"https://github.com/Activiti/Activiti"}],"references":["https://github.com/Activiti/Activiti/issues/5438","https://github.com/Activiti/Activiti","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","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","https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task"],"weaknesses":["CWE-917"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/91xxx/CVE-2026-91145.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-91145","state":"PUBLISHED","datePublished":"2026-09-14T21:45:45.317Z","dateUpdated":"2026-09-24T14:22:12.311Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-14T20:35:44.937Z"},"containers":{"cna":{"title":"Activiti through 7.1.0.M6 Expression Injection via Mail Task","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Activiti","product":"Activiti","packageURL":"pkg:maven/org.activiti/activiti-engine","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.1.0.M6","versionType":"custom"}],"repo":"https://github.com/Activiti/Activiti"}],"references":[{"url":"https://github.com/Activiti/Activiti/issues/5438","tags":["issue-tracking"],"name":"GitHub Issue #5438"},{"url":"https://github.com/Activiti/Activiti","tags":["product"]},{"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","tags":["technical-description"],"name":"ExpressionResolver.java at 7.1.0.M6"},{"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","tags":["technical-description"],"name":"MailActivityBehavior.java at 7.1.0.M6"},{"url":"https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task","name":"VulnCheck Advisory: Activiti through 7.1.0.M6 Expression Injection via Mail Task","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-917","lang":"en","description":"Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-24T14:22:12.311Z"},"datePublic":"2026-06-13T00:00:00.000Z","credits":[{"lang":"en","value":"George Chen","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Activiti/Activiti/issues/5438","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T13:37:15.686978Z","id":"CVE-2026-91145","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T13:37:55.083Z"}}]}}}