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Vulnerability record · CVE-2026-35482 · published 2 June 2026

CVE-2026-35482: Alf incorrect authorization vulnerability

Alf · Alf

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.

9.1 CVSS 3.1 Critical EPSS 0.42% · top 66.6% CWE-863 · Incorrect authorization
9.1CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
12 Aug 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2024-25635Alf vulnerabilityalf.io is an open source ticket reservation system. Prior to version 2.0-Mr-2402, organization owners can view the generated API KEY and USERS of oth…EPSS 0.72%8.8CVE-2023-2258Alf csv injection vulnerabilityImproper Neutralization of Formula Elements in a CSV File in GitHub repository alfio-event/alf.io prior to 2.0-M4-2304.EPSS 0.91%8.8CVE-2023-2260Alf insecure direct object reference vulnerabilityAuthorization Bypass Through User-Controlled Key in GitHub repository alfio-event/alf.io prior to 2.0-M4-2304.EPSS 0.86%7.6CVE-2024-25628Alf insufficient session expiration vulnerabilityAlf.io is a free and open source event attendance management system. In versions prior to 2.0-M4-2402 users can access the admin area even after bein…EPSS 0.38%7.2CVE-2023-2259Alf code injection vulnerabilityImproper Neutralization of Special Elements Used in a Template Engine in GitHub repository alfio-event/alf.io prior to 2.0-M4-2304.EPSS 1.1%6.5CVE-2024-45299Alf vulnerabilityalf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. Prior to version 2.0-M5, the preloaded data …EPSS 0.72%6.5CVE-2024-25634Alf vulnerabilityalf.io is an open source ticket reservation system. Prior to version 2.0-Mr-2402, an attacker can access data from other organizers. The attacker can…EPSS 0.75%5.9CVE-2024-45300Alf race condition vulnerabilityalf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. Prior to version 2.0-M5, a race condition al…EPSS 0.42%

Source: NIST National Vulnerability Database (record CVE-2026-35482), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.