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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Activiti | Activiti | ≤ 7.1.0.M6 | — |
References
- GitHub Issue #5438 issue-tracking
- https://github.com/Activiti/Activiti product
- ExpressionResolver.java at 7.1.0.M6 technical-description
- MailActivityBehavior.java at 7.1.0.M6 technical-description
- VulnCheck Advisory: Activiti through 7.1.0.M6 Expression Injection via Mail Task third-party-advisory