CVE-2026-35482 | THREATINT

Description

alf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. Prior to version 2.0-M5-2606, a sandbox escape vulnerability in the alf.io extension script engine allows an authenticated administrator to execute arbitrary operating system commands on the server. The extension system is intended to execute restricted JavaScript in a sandboxed Rhino environment; however, a combination of an unguarded injected Java object (`returnClass`) and an incomplete AST blocklist allows the sandbox to be fully escaped using Java reflection without triggering any validation errors. Version 2.0-M5-2606 patches the issue.

PUBLISHED Reserved 2026-04-02 | Published 2026-06-02 | Updated 2026-06-03 | Assigner GitHub_M

HIGH: 8.0CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-863: Incorrect Authorization

Product status

< 2.0-M5-2606

affected

References

github.com/...alf.io/security/advisories/GHSA-3w8f-mcf6-cm7h exploit

github.com/...alf.io/security/advisories/GHSA-3w8f-mcf6-cm7h

cve.org (CVE-2026-35482)

nvd.nist.gov (CVE-2026-35482)

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