---
id: "CVE-2026-112291"
kind: "vulnerability"
aliases: ["CVE-2026-112291"]
title: "Flarum Extension Manager leaks task output to unauthenticated internet visitors"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["flarum", "package", "php", "self-hosted"]
not_affected_if: ["beta.8-or-later", "extension-not-installed"]
published_at: "2026-10-19T14:17:07+00:00"
first_seen_at: "2026-10-23T21:57:18+00:00"
updated_at: "2026-10-25T03:40:47+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112291", "first_seen_at": "2026-10-23T21:57:18+00:00"}]
---

# Flarum Extension Manager leaks task output to unauthenticated internet visitors

Flarum Extension Manager 2.0.0-beta.1 through earlier beta builds skip authentication and admin checks on its task listing endpoint. A remote attacker can read filesystem paths, installed extensions, their versions and the PHP version.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed version of the Flarum Extension Manager extension with `composer show flarum/extension-manager` and confirm whether it is `2.0.0-beta.1` or a later beta below `2.0.0-beta.8`.
- Request `/api/extension-manager-tasks` from outside the network without logging in and see whether a JSON task list is returned.

## Fix

- Upgrade the Flarum Extension Manager extension to `2.0.0-beta.8` or later with `composer update flarum/extension-manager`.
- Until upgraded, block `/api/extension-manager-tasks` at the web server or reverse proxy.

## Timeline

- 2026-10-23T21:57:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112291

## From the sources

Flarum Extension Manager 2.0.0-beta.1 before 2.0.0-beta.8 lacks authentication and admin checks on the TaskResource index endpoint, allowing unauthenticated information disclosure. Remote attackers can send GET requests to /api/extension-manager-tasks to read task output revealing filesystem paths, installed extensions, versions, and PHP version.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_