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.
History

Wed, 03 Jun 2026 02:30:00 +0000

Type Values Removed Values Added
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.
Title alf.io vulnerable to Arbitrary File Read and Exfil via simpleHttpClient Extension Script
Weaknesses CWE-22
CWE-73
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-02T22:51:36.358Z

Reserved: 2026-04-20T15:32:33.812Z

Link: CVE-2026-41412

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-02T23:16:37.793

Modified: 2026-06-02T23:16:37.793

Link: CVE-2026-41412

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.