What’s Vulnerable › Vulnerabilities

CVE-2026-41412: alf.io vulnerable to Arbitrary File Read and Exfil via simpleHttpClient Extension Script

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-02 · updated 2026-07-21
• Weakness: CWE-22

Description

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.

Affected products

• alfio-event alf.io: before 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

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