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Vulnerability record · CVE-2026-91145 · published 14 September 2026

CVE-2026-91145: Expression language injection vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.42% · top 66.0% CWE-917 · Expression language injection Awaiting Analysis
7.1CVSS 4.0 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
24 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/Activiti/Activiti
https://github.com/Activiti/Activiti/blob/7.1.0.M6/activiti-core/activiti-api-impl/activiti-api-process-runtime-impl/src
https://github.com/Activiti/Activiti/blob/7.1.0.M6/activiti-core/activiti-engine/src/main/java/org/activiti/engine/impl/
https://github.com/Activiti/Activiti/issues/5438
https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task
https://github.com/Activiti/Activiti/issues/5438

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Source: NIST National Vulnerability Database (record CVE-2026-91145), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.