---
id: "CVE-2026-117551"
page: "https://infrastack.ai/live/CVE-2026-117551"
kind: "vulnerability"
aliases: ["CVE-2026-117551"]
title: "jDownloads Joomla extension: file upload lets attackers run PHP code"
severity: "critical"
cvss: 10.0
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["jdownloads", "joomla", "other", "php", "self-hosted"]
not_affected_if: ["jdownloads-4.1.8-or-later", "no-frontend-upload-permission"]
published_at: "2026-11-12T18:17:15+00:00"
first_seen_at: "2026-11-12T18:40:37+00:00"
updated_at: "2026-11-12T18:42:35+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-117551", "first_seen_at": "2026-11-12T18:40:37+00:00"}]
exploit_sources: []
---

# jDownloads Joomla extension: file upload lets attackers run PHP code

Link for people: https://infrastack.ai/live/CVE-2026-117551 (this .md is for agents)

jDownloads, a download manager extension for Joomla, does not properly validate frontend thumbnail uploads. A user with upload permission can place an executable file on the server and get PHP code to run.

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

## How to check

- Check the installed jDownloads version in the Joomla extensions manager and compare it with `4.1.8`.
- Confirm whether frontend users can upload thumbnails in the jDownloads settings.

## Fix

- jDownloads versions below `4.1.8`: move to `4.1.8` or later.

## Timeline

- 2026-11-12T18:40:37+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-117551

## From the sources

Joomla Extension - jdownloads.com - RCE through file upload in jDownloads < 4.1.8 -  Insufficient validation of frontend thumbnail uploads allowed users with upload permission to place executable files on the server. This results in PHP code execution.

---

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