Vulnerability · Published Sep 9, 2026 · Assigned by GitHub_M

CVE-2026-50165alf.io has Improper Access Control for Organization Owners that Exposes System Secrets

High 7.1

In plain English

A high-severity improper access control in alf.io from alfio-event. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.4%top 71.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

alf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. An Improper Access Control issue in versions prior to 2.0-M5-2605 allows an organization owner to read system-level configuration secrets through organization/event scoped "single configuration" endpoints. The affected endpoints require organization or event ownership, but they accept an arbitrary configuration key and then return the first matching value from a lookup that includes system-level configuration. As a result, an organization owner can retrieve secrets intended to be administrator-only, including the system API key when it is configured. Version 2.0-M5-2605 fixes the issue.

Affected products (as reported)

Vendor	Product	Versions
alfio-event	alf.io	< 2.0-M5-2606

Weakness: CWE-284 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/alfio-event/alf.io/security/advisories/GHSA-x473-r8w6-fcq5 x_refsource_CONFIRM