CVE-2026-35482: CWE-863: Incorrect Authorization in alfio-event alf.io
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.
AI Analysis
Technical Summary
CVE-2026-35482 is an incorrect authorization vulnerability (CWE-863) in alf.io's extension script engine. The system uses a sandboxed Rhino JavaScript environment intended to restrict script execution. However, due to an unguarded injected Java object (`returnClass`) and an incomplete abstract syntax tree (AST) blocklist, an authenticated administrator can fully escape the sandbox via Java reflection without triggering validation errors. This enables arbitrary OS command execution on the server. The vulnerability affects versions prior to 2.0-M5-2606, which includes all versions before this patch release.
Potential Impact
An authenticated administrator can exploit this vulnerability to execute arbitrary operating system commands on the server hosting alf.io. This can lead to full system compromise, including confidentiality, integrity, and availability impacts. The CVSS v3.1 base score is 8.0 (High), reflecting network attack vector, high privileges required, no user interaction, and complete impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Version 2.0-M5-2606 of alf.io patches this vulnerability. Users should upgrade to version 2.0-M5-2606 or later to remediate this issue. No other mitigation or temporary workaround is indicated in the available data.
CVE-2026-35482: CWE-863: Incorrect Authorization in alfio-event alf.io
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.
CVSS v3.1
Score 8.0high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-35482 is an incorrect authorization vulnerability (CWE-863) in alf.io's extension script engine. The system uses a sandboxed Rhino JavaScript environment intended to restrict script execution. However, due to an unguarded injected Java object (`returnClass`) and an incomplete abstract syntax tree (AST) blocklist, an authenticated administrator can fully escape the sandbox via Java reflection without triggering validation errors. This enables arbitrary OS command execution on the server. The vulnerability affects versions prior to 2.0-M5-2606, which includes all versions before this patch release.
Potential Impact
An authenticated administrator can exploit this vulnerability to execute arbitrary operating system commands on the server hosting alf.io. This can lead to full system compromise, including confidentiality, integrity, and availability impacts. The CVSS v3.1 base score is 8.0 (High), reflecting network attack vector, high privileges required, no user interaction, and complete impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Version 2.0-M5-2606 of alf.io patches this vulnerability. Users should upgrade to version 2.0-M5-2606 or later to remediate this issue. No other mitigation or temporary workaround is indicated in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-02T20:49:44.454Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1f64cce29bf47b5010d690
Added to database: 06/02/2026, 23:18:36 UTC
Last enriched: 06/10/2026, 11:09:35 UTC
Last updated: 07/24/2026, 20:52:05 UTC
Views: 128
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