Threats affecting pkg:maven/org.activiti/activiti

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.

CVE-2026-3967 is a medium severity deserialization vulnerability in Alfresco Activiti versions up to 7.19 and 8.8.0. The flaw exists in the deserialize/createObjectInputStream function within the Process Variable Serialization System, allowing remote attackers to exploit unsafe deserialization. No authentication or user interaction is required, and the vulnerability can be triggered remotely over the network. Although an exploit has been published, there are no known active exploits in the wild yet. The vendor has not responded to disclosure attempts, and no official patches are currently available. This vulnerability could lead to partial compromise of confidentiality, integrity, and availability of affected systems. Organizations using Alfresco Activiti should apply strict input validation, isolate vulnerable components, and monitor for suspicious activity until a patch is released.