CVE-2019-7743 Joomla! Object Injection Vulnerability
Attackers can achieve remote code execution in Joomla by exploiting the phar:// stream wrapper for object injection.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-7743?
CVE-2019-7743 is a critical unsafe deserialization vulnerability in Joomla Joomla\!, published on 12 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Joomla! before 3.9.3. The phar:// stream wrapper can be used for objection injection attacks because there is no protection mechanism (such as the TYPO3 PHAR stream wrapper) to prevent use of the phar:// handler for non .phar-files.
Which versions are affected by CVE-2019-7743?
2 open source packages ship an affected version, including joomla/joomla-cms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
joomla/joomla-cms Packagist | From 2.5.0 | 3.9.3 |
joomla/joomla-cms Packagist | From 2.5.0 | 3.9.3 |
Products include Joomla Joomla\!.
How do I fix CVE-2019-7743?
Upgrade joomla/joomla-cms to 3.9.3 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2019-7743 being exploited?
There is no known exploitation of CVE-2019-7743 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-5m3w-rvvh-8fx6.