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CVE-2026-91145 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/Activiti/Activiti/issues/5438	CISA-ADP
https://github.com/Activiti/Activiti	[email protected]
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	[email protected]
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	[email protected]
https://github.com/Activiti/Activiti/issues/5438	[email protected]
https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-917	Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 15, 2026	CVE Modified	CISA-ADP
Sep 14, 2026	New CVE Received	[email protected]