CVE-2026-91145CWE-917

CVE-2026-91145

High · published September 15, 2026

CVSS v3.1
7.1
EPSS
0%
Percentile
35.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0
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
EPSS
0.00422 · 35.5th percentile
Weakness
CWE-917 · Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
Published
2026-09-15T02:16Z
References (6)
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]https://github.com/Activiti/Activiti/issues/5438 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 14 SEP 21:45Z
    Activiti through 7.1.0.M6 Expression Injection via Mail Task
    cvelistv5