CVE-2026-91145
Activiti through 7.1.0.M6 Expression Injection via Mail Task
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 14, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 14, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | 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 | VulnCheck |
| 3.1 | 7.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N | VulnCheck |
Weaknesses
- CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
Affected Products
| Product | Versions |
|---|---|
ActivitiActiviti |
|
References
- GitHub Issue #5438issue-tracking
- https://github.com/Activiti/Activitiproduct
- ExpressionResolver.java at 7.1.0.M6technical-description
- MailActivityBehavior.java at 7.1.0.M6technical-description
- VulnCheck Advisory: Activiti through 7.1.0.M6 Expression Injection via Mail Taskthird-party-advisory
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