CVE-2026-91145
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
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 in the full Spring context when a mail task uses variable-backed body fields, enabling method invocation on application beans.
Risk Assessment
An attacker can invoke arbitrary methods on Spring beans, potentially leading to remote code execution and full application compromise.
Recommendation
Upgrade Activiti to a version later than 7.1.0.M6 that includes a fix for expression validation.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

