CVE-2018-11326 Joomla! XSS Vulnerability

What is CVE-2018-11326?

CVE-2018-11326 is a medium-severity cross-site scripting vulnerability in Joomla Joomla\!, published on 22 May 2018. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

An issue was discovered in Joomla! Core before 3.8.8. Inadequate input filtering leads to a multiple XSS vulnerabilities. Additionally, the default filtering settings could potentially allow users of the default Administrator user group to perform a XSS attack.

Weakness: CWE-79

Which versions are affected by CVE-2018-11326?

2 open source packages ship an affected version, including joomla/joomla-cms. It affects 1 product.

Products include Joomla Joomla\!.

How do I fix CVE-2018-11326?

Upgrade joomla/joomla-cms to 3.8.8 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2018-11326 being exploited?

There is no known exploitation of CVE-2018-11326 in the wild and no public exploit code.

Other vulnerabilities in Joomla Joomla\!

• CVE-2016-10033 PHPMailer Command Injection Exploited Critical 9.8
• CVE-2023-23752 Joomla! Improper Access Control Exploited Medium 5.3
• CVE-2026-48902 Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset links Critical 9.8
• CVE-2025-25226 [20250401] - Joomla Framework - SQL injection vulnerability in quoteNameStr method of Database package Critical 9.8
• CVE-2022-23795 [20220303] - Core - User row are not bound to a authentication mechanism Critical 9.8

All Joomla Joomla\! vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-g3m5-vvj7-xrwv.