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CVE-2026-91145— Activiti through 7.1.0.M6 Expression Injection via Mail Task

Quick assessment

Affected
Activiti Activiti
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Activiti 7.1.0.M6 及以下版本未能验证流程变量中的“hash-brace”延迟表达式（即形如 的 Spring 表达式），从而允许攻击者绕过表达式过滤机制。攻击者可以注入以 开头的表达式，这些表达式会被存储起来，并在邮件任务使用变量驱动的内容字段时，在完整的 Spring 上下文中被求值，进而实现对应用程序 Bean 的方法调用。

CVSS 7.1 · High EPSS 0.24% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Activiti Activiti ≤ 7.1.0.M6 affected
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I. Basic Information for CVE-2026-91145

Vulnerability Information
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Vulnerability Title
Activiti through 7.1.0.M6 Expression Injection via Mail Task
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
表达式语言语句中使用的特殊元素转义处理不恰当(表达式语言注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Activiti Activiti 0 ~ 7.1.0.M6 -

II. Public POCs for CVE-2026-91145

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III. Intelligence Information for CVE-2026-91145

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Vendor Advisories for CVE-2026-91145 (1)

Security Blog Posts for CVE-2026-91145 (1)

Vendor Pages for CVE-2026-91145 (2)

Other References for CVE-2026-91145 (1)

IV. Related Vulnerabilities

Same product: Activiti
Same weakness: CWE-917

V. Comments for CVE-2026-91145

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