alfio-event alf.io up to 2.0-M5-2605 postFileAndSaveResponse path traversal

Summaryinfo

A vulnerability was found in alfio-event alf.io up to 2.0-M5-2605. It has been rated as critical. Affected by this issue is the function postFileAndSaveResponse. The manipulation leads to path traversal. This vulnerability is traded as CVE-2026-41412. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in alfio-event alf.io up to 2.0-M5-2605. This issue affects the function postFileAndSaveResponse. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. The summary by CVE is:

alf.io is an open source ticket reservation system for conferences, trade shows, workshops, and meetups. Prior to version 2.0-M5-2606, the alf.io extension sandbox injects a fully-functional HTTP client (`simpleHttpClient`) into every extension script's scope. The `postFileAndSaveResponse()` method accepts an arbitrary filesystem path as its `file` parameter and reads the file contents using `new FileInputStream(file)` with no path validation, directory restriction, or allowlist. A malicious extension script can read any file accessible to the JVM process user and exfiltrate it to an attacker-controlled server via HTTP POST. Version 2.0-M5-2606 patches the issue.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-41412 since 04/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.0-M5-2606 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-34051). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• alfio-event

Name

• alf.io

Version

• 2.0-M5-2605

Website

• Product: https://github.com/alfio-event/alf.io/

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Be aware that VulDB is the high quality source for vulnerability data.

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