CVE-2026-73336

Analyzed Analyzed - Analysis Complete

Cross-Site Scripting in Joomla Core via schema.org Outputs

Publication date: 2026-08-18

Last updated on: 2026-09-03

Assigner: Joomla! Project

Description

Joomla! Core - [20260806] - XSS through schema.org outputs in Joomla 5.1.0-5.4.7, 6.0.0-6.1.2 - Improper escaping flags lead to an XSS vector in schema.org markup outputs.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-18

Last Modified

2026-09-03

Generated

2026-09-07

AI Q&A

2026-08-18

EPSS Evaluated

2026-09-06

NVD

CVE-2026-73336

EUVD

EUVD-2026-61032

Affected Vendors & Products

Vendor	Product	Version / Range
joomla	joomla!	From 5.1.0 (inc) to 5.4.8 (exc)
joomla	joomla!	From 6.0.0 (inc) to 6.1.3 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

CVE-2026-73336 is a Cross-Site Scripting (XSS) vulnerability in Joomla! CMS versions 5.1.0-5.4.7 and 6.0.0-6.1.2. It occurs due to improper escaping flags in schema.org markup outputs, creating an XSS vector. This allows attackers to inject malicious scripts into web pages viewed by users.

Detection Guidance

To detect this vulnerability, check your Joomla version against affected releases (5.1.0-5.4.7 and 6.0.0-6.1.2). Use commands like 'composer show joomla/joomla' or check the Joomla admin panel under System > System Information. If vulnerable, update to versions 5.4.8 or 6.1.3 immediately.

Impact Analysis

This vulnerability could allow attackers to execute malicious scripts in the context of a user's browser when visiting a Joomla site. This may lead to theft of session cookies, account takeover, or defacement of the website. Users with vulnerable Joomla versions should upgrade immediately.

Compliance Impact

XSS vulnerabilities can compromise data integrity and confidentiality, potentially violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations must address this to maintain compliance and avoid legal penalties.

Mitigation Strategies

Upgrade Joomla! to versions 5.4.8 or 6.1.3 or later to address the XSS vulnerability in schema.org outputs.

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