# CVE-2026-91145

## Summary

- **CVE ID:** CVE-2026-91145
- **Severity:** HIGH
- **CVSS Score:** 7.1 (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)
- **CWE:** CWE-917
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 15, 2026

## 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

- Activiti — Activiti (0)

## References

- [CNA](https://github.com/Activiti/Activiti/issues/5438)
- [CNA](https://github.com/Activiti/Activiti)
- [CNA](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)
- [CNA](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)
- [CNA](https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 15.6

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._