# 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.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jun 2026
- **Updated:** 3 Jun 2026
- **Also known as:** GHSA-6m62-53cw-4373

## 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.

Weakness: CWE-73 (External Control of File Name or Path), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## 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.

## Is CVE-2026-41412 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41412 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41412 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41412 exists.

Affected product: alfio-event alf.io. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-41412/ (Markdown: https://insights.sbomify.com/CVE-2026-41412/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41412
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41412
- OSV: https://osv.dev/vulnerability/CVE-2026-41412

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41412/
Summaries are generated and may contain mistakes; the official description above is the record.