CVE-2026-35482 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-35482CRITICAL

alfio-event alf.io — alf.io has an Authenticated RCE via Extension Script Sandbox Escape

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   H   N  C  H  H  H    9.1   .0028   20.8     —

AFFECTED
  Product  Versions         Fixed
  alf.io   < 2.0-M5-2606 –  —

TIMELINE
  Apr 2   Reserved by GitHub_M
  Jun 2   EXPLOIT PUBLISHED — CVE-2026-35482 (alfio-event alf.io). Public exploit reference added.
  Jun 2   Published (CNA: GitHub_M)

CWE-863 · CNA: GitHub_M · CVSS v3.1 · 1 reference · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 2, 2026	Reserved	Reserved by GitHub_M
June 2, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-35482 (alfio-event alf.io). Public exploit reference added.
June 2, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
alfio-event	alf.io	—	< 2.0-M5-2606	—

Weaknesses

CWE-863

References (1)

https://github.com/alfio-event/alf.io/security/advisories/GHSA-3w8f-mcf6-cm7h [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-35482 at cve.org

Vendors: alfio-event

Weaknesses: CWE-863

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-35482 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.