# CVE-2026-41412: Alf.io arbitrary file read and exfiltration in extension sandbox

Source: https://junglewise.ai/threats/cve-2026-41412-alf-io-arbitrary-file-read-and-exfiltration-in-extension-sandbox  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-02. Updated: 2026-06-02  
License: CC BY 4.0 with a link back

CVE-2026-41412 · Severity: medium · CVSS 4.9 · Published 2026-06-02

Alf.io is an open-source ticket reservation system used for managing events like conferences and trade shows. A security flaw allows an administrator to upload a malicious script that can read any file on the server, such as database passwords, encryption keys, or customer data. This information can then be automatically sent to a server controlled by the attacker, leading to a significant data breach.

Technologies: [Alf.Io](https://junglewise.ai/threats/technologies/alf-io). Vendors: [Alf.Io](https://junglewise.ai/threats/vendors/alf-io).

## Quick answers

**Is CVE-2026-41412 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-41412 being exploited in the wild.

**How severe is CVE-2026-41412?** Medium severity, with a CVSS score of 4.9, published 2 June 2026.

**Which products and versions are affected?** Alf.Io <= 2.0-M5-2509-1.

**Is there a fix for CVE-2026-41412?** A patch was published on 2026-06-02: Fixed in version 2.0-M5-2606 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-41412 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-41412?** Check whether you run Alf.Io at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A path traversal vulnerability exists in the Alf.io extension sandbox due to the injection of a fully-functional HTTP client (`simpleHttpClient`) into the scope of extension scripts. The `postFileAndSaveResponse()` method in this client accepts an arbitrary filesystem path as a parameter and uses `new FileInputStream(file)` without any path validation, directory restrictions, or allowlists. An authenticated attacker with administrative privileges can create a malicious JavaScript extension to read sensitive files (such as `application.properties` or SSH keys) accessible to the JVM process and exfiltrate them via an HTTP POST request to an external server. The issue is fixed in version 2.0-M5-2606.

## Affected products

- alfio-event Alf.io <= 2.0-M5-2509-1

## Timeline

- 2026-06-02: disclosed
- 2026-06-02: advisory
- 2026-06-02: patched: Fixed in version 2.0-M5-2606

## References

- [https://github.com/alfio-event/alf.io/security/advisories/GHSA-6m62-53cw-4373](https://github.com/alfio-event/alf.io/security/advisories/GHSA-6m62-53cw-4373)

## Related threats

- [alf.io improper access control in configuration endpoints](https://junglewise.ai/threats/cve-2026-50165-alf-io-improper-access-control-in-configuration-endpoints)
- [alf.io sandbox escape in extension script engine](https://junglewise.ai/threats/cve-2026-35482-alf-io-sandbox-escape-in-extension-script-engine)