CVE-2016-9836 File upload in n/a
Attackers can upload and execute malicious PHP files by using alternative extensions like .php6 or .phtml due to insufficient filtering in Joomla.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2016-9836?
CVE-2016-9836 is a critical vulnerability in Joomla Joomla\!, published on 5 Dec 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The file scanning mechanism of JFilterInput::isFileSafe() in Joomla! CMS before 3.6.5 does not consider alternative PHP file extensions when checking uploaded files for PHP content, which enables a user to upload and execute files with the `.php6`, `.php7`, `.phtml`, and `.phpt` extensions. Additionally, JHelperMedia::canUpload() did not blacklist these file extensions as uploadable file types.
Weakness: CWE-284
Which versions are affected by CVE-2016-9836?
It affects 1 product.
Products include Joomla Joomla\!.
How do I fix CVE-2016-9836?
No fix has been published for CVE-2016-9836 yet. Limit exposure of the affected software until one is available.
Is CVE-2016-9836 being exploited?
There is no known exploitation of CVE-2016-9836 in the wild and no public exploit code.
Other vulnerabilities in Joomla Joomla\!
- CVE-2016-10033 PHPMailer Command Injection
- CVE-2023-23752 Joomla! Improper Access Control
- CVE-2026-48902 Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset links
- CVE-2025-25226 [20250401] - Joomla Framework - SQL injection vulnerability in quoteNameStr method of Database package
- CVE-2022-23795 [20220303] - Core - User row are not bound to a authentication mechanism
Sources
Also known as GHSA-43p3-cf56-rpqr.