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CVE-2026-35482 CRITICAL CVSS 9.1 Java Verified Advisory

Authenticated RCE via extension script sandbox escape in alf.io (CVE-2026-35482)

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 runs restricted JavaScript in a sandboxed Rhino environment, but an unguarded injected Java object (`returnClass`) enables full sandbox escape via Java reflection without triggering any validation errors. Exploitation occurs when a malicious extension script is saved and the chosen event fires. Affected versions: - ≤ 2.0-M5-2509-1 We recommend updating to: 2.0-M5-2606. CVSS 9.1 · our assessment: act_now Reference: https://github.com/alfio-event/alf.io/security/advisories/GHSA-3w8f-mcf6-cm7h Details: https://vuln.today/cve/CVE-2026-35482

Verified by vuln.today against published advisories.

Affected versions

  • – ≤ 2.0-M5-2509-1

Fixed in: 2.0-M5-2606

Full CVE analysis Reference Published Aug 12, 2026

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