EUVD-2026-75140Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network endpoint requires org-owner auth (PR:L); direct exploitation is read-only (C:H, I:N); no scope change as all impact is within the alf.io system.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Improper access control in alf.io's organization/event-scoped 'single configuration' endpoints allows authenticated organization owners to exfiltrate system-level secrets-including the administrator system API key-by supplying arbitrary configuration key names to endpoints that perform a cross-scope lookup without restricting results to the caller's authorization tier. All alf.io deployments running versions prior to 2.0-M5-2605 where organization-owner accounts are held by partially trusted or untrusted parties are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid alf.io account holding organization or event ownership (PR:L per CVSS 4.0); anonymous users and lower-privilege attendee accounts cannot exploit this directly. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N with a score of 7.1 reasonably characterizes the vulnerability: network-accessible, low-complexity exploitation requiring only organization-owner credentials (PR:L), with high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade alf.io to version 2.0-M5-2605 or later, which restricts the configuration key lookup on organization/event 'single configuration' endpoints to prevent returning system-tier values. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and audit all alf.io instances to determine their versions and confirm whether they run versions prior to 2.0-M5-2605 (the vulnerable range). …
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Cross-site Scripting (XSS) - Stored in GitHub repository alfio-event/alf.io prior to Alf.io 2.0-M4-2301. Rated medium se
Cross-site Scripting (XSS) - Reflected in GitHub repository alfio-event/alf.io prior to 2.0-M4-2301. Rated medium severi
Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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