CVE-2026-91145
Activiti through 7.1.0.M6 Expression Injection via Mail Task
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-917 |
| Vendor | activiti |
| Product | activiti |
| Published | Sep 14, 2026 |
| Last Updated | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
Activiti / Activiti
0 ≤ 7.1.0.M6
References
github.com: https://github.com/Activiti/Activiti/issues/5438 github.com: https://github.com/Activiti/Activiti github.com: 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 github.com: 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 vulncheck.com: https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task
Credits
🔍 George Chen