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    CVE-2026-35482

    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:Jun 2, 2026
    Last Modified:Aug 12, 2026
    EPS:Jun 2, 2026
    EPSS Score:0.00211
    CVSS Score:8

    Affected Products

    Vendor
    Alf
    Product
    Alf
    Vendor
    Alfio-event
    Product
    Alf.io

    Exploits

    https://github.com/alfio-event/alf.io/security/advisories/GHSA-3w8f-mcf6-cm7hhttps://github.com/alfio-event/alf.io/security/advisories/GHSA-3w8f-mcf6-cm7h

    Common Weakness Enumeration

    CWE-863 Incorrect Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2024-45300 (CVSS 7.5) — alf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. Prior…
    CVE-2024-45299 (CVSS 6.5) — alf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. Prior…
    CVE-2024-25634 (CVSS 7.2) — alf.io is an open source ticket reservation system. Prior to version 2.0-Mr-2402, an attacker can access data …
    CVE-2024-25635 (CVSS 8.8) — alf.io is an open source ticket reservation system. Prior to version 2.0-Mr-2402, organization owners can view…
    CVE-2024-25627 (CVSS 3.5) — Alf.io is a free and open source event attendance management system. An administrator on the alf.io applicatio…
    CVE-2024-25628 (CVSS 7.6) — Alf.io is a free and open source event attendance management system. In versions prior to 2.0-M4-2402 users ca…
    CVE-2023-2260 (CVSS 8.8) — Authorization Bypass Through User-Controlled Key in GitHub repository alfio-event/alf.io prior to 2.0-M4-2304.…
    CVE-2023-2259 (CVSS 7.2) — Improper Neutralization of Special Elements Used in a Template Engine in GitHub repository alfio-event/alf.io …
    CVE-2023-2258 (CVSS 8.8) — Improper Neutralization of Formula Elements in a CSV File in GitHub repository alfio-event/alf.io prior to 2.0…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High