CVE-2026-41412 alf.io vulnerable to Arbitrary File Read and Exfil via simpleHttpClient Extension Script
A malicious extension script can read arbitrary files from the server and exfiltrate them via HTTP due to lack of path validation in the HTTP client.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-41412?
CVE-2026-41412 is a medium-severity path traversal vulnerability in alfio-event alf.io, published on 2 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-41412?
How do I fix CVE-2026-41412?
No fix has been published for CVE-2026-41412 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-41412 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41412 exists.
Sources
Also known as GHSA-6m62-53cw-4373.