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.
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Affected Vendors & Products
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History
Wed, 03 Jun 2026 15:30:00 +0000
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ssvc
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Wed, 03 Jun 2026 12:45:00 +0000
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Alfio-event
Alfio-event alf.io |
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Alfio-event
Alfio-event alf.io |
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| 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. | |
| Title | alf.io has an Authenticated RCE via Extension Script Sandbox Escape | |
| Weaknesses | CWE-863 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-06-02T22:50:40.435Z
Updated: 2026-06-03T14:08:53.231Z
Reserved: 2026-04-02T20:49:44.454Z
Link: CVE-2026-35482
Updated: 2026-06-03T14:08:42.265Z
Status : Received
Published: 2026-06-02T23:16:37.473
Modified: 2026-06-03T16:16:28.630
Link: CVE-2026-35482
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