---
id: "CVE-2026-50539"
kind: "vulnerability"
aliases: ["CVE-2026-50539"]
title: "Xibo: any logged-in user can download admin notification attachments"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["digital-signage", "package", "self-hosted", "xibo"]
not_affected_if: ["no-non-admin-users", "version-4.4.3-or-later"]
published_at: "2026-10-28T16:17:07+00:00"
first_seen_at: "2026-10-28T16:33:49+00:00"
updated_at: "2026-10-28T16:35:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50539", "first_seen_at": "2026-10-28T16:33:49+00:00"}]
---

# Xibo: any logged-in user can download admin notification attachments

Xibo digital signage platform before 4.4.3 lacks an object-level authorization check on the notification export endpoint. An authenticated non-admin user can iterate sequential notification IDs and download attachments from any notification, including ones created by administrators.

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

## How to check

- Check the Xibo CMS version in the admin UI or package files; versions below `4.4.3` are affected.
- Confirm whether non-admin users have access to the Notification Centre, which is granted by default.

## Fix

- Upgrade Xibo CMS to `4.4.3` or later.
- Until upgraded, review notification attachments for sensitive content and limit non-admin access to the Notification Centre.

## Timeline

- 2026-10-28T16:33:49+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-50539

## From the sources

Xibo is an open source digital signage platform with a web content management system and Windows display player software. Prior to 4.4.3, missing object-level authorization on `/notification/export/{id}` allows an authenticated user to download attachments from any notification, including notifications created by administrators, by iterating over `sequential notification IDs`. Exploitation requires access to the `Notification Centre` to view past notifications, a privilege granted to non-administrators as standard. This issue is fixed in version 4.4.3.

---

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