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CVE-2026-41412— alf.io vulnerable to Arbitrary File Read and Exfil via simpleHttpClient Extension Script

Quick assessment

Affected
alfio-event alf.io
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.

Alf.io是Alf.io开源的一款免费开源活动出席管理系统。 Alf.io 2.0-M5-2606之前版本存在安全漏洞，该漏洞源于扩展沙箱注入的HTTP客户端postFileAndSaveResponse方法接受任意文件系统路径且无路径验证，可能导致恶意扩展脚本读取JVM进程可访问的任何文件并通过HTTP POST泄露。

CVSS 4.9 · Medium EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
alfio-event alf.io < 2.0-M5-2606 affected
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I. Basic Information for CVE-2026-41412

Vulnerability Information
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Vulnerability Title
alf.io vulnerable to Arbitrary File Read and Exfil via simpleHttpClient Extension Script
Source: CVE Program / CVE List V5
Vulnerability Description
alf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. Prior to version 2.0-M5-2606, the alf.io extension sandbox injects a fully-functional HTTP client (`simpleHttpClient`) into every extension script's scope. The `postFileAndSaveResponse()` method accepts an arbitrary filesystem path as its `file` parameter and reads the file contents using `new FileInputStream(file)` with no path validation, directory restriction, or allowlist. A malicious extension script can read any file accessible to the JVM process user and exfiltrate it to an attacker-controlled server via HTTP POST. Version 2.0-M5-2606 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Alf.io 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Alf.io是Alf.io开源的一款免费开源活动出席管理系统。 Alf.io 2.0-M5-2606之前版本存在安全漏洞，该漏洞源于扩展沙箱注入的HTTP客户端postFileAndSaveResponse方法接受任意文件系统路径且无路径验证，可能导致恶意扩展脚本读取JVM进程可访问的任何文件并通过HTTP POST泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
alfio-event alf.io < 2.0-M5-2606 -

II. Public POCs for CVE-2026-41412

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III. Intelligence Information for CVE-2026-41412

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Vendor Advisories for CVE-2026-41412 (1)

IV. Related Vulnerabilities

Same product: alf.io
Same vendor: alfio-event
Same weakness: CWE-22

V. Comments for CVE-2026-41412

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