CVE-2026-90906

Analyzed Analyzed - Analysis Complete

Cross-Site Scripting in Joomla Core via HTMLHelper::link

Publication date: 2026-09-29

Last updated on: 2026-10-06

Assigner: Joomla! Project

Description

Joomla! Core - [20260901] - XSS in HTMLHelper::link method in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3 - Lack of escaping leads to XSS vulnerabilities in the link method of the HTML Helper.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-29

Last Modified

2026-10-06

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-90906

EUVD

EUVD-2026-89114

Affected Vendors & Products

Vendor	Product	Version / Range
joomla	joomla!	From 6.0.0 (inc) to 6.1.3 (exc)
joomla	joomla!	From 1.5.0 (inc) to 5.4.8 (exc)

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

This vulnerability is a Cross-Site Scripting (XSS) issue in Joomla! Core versions 1.5.0-5.4.8 and 6.0.0-6.1.3. It occurs in the HTMLHelper::link method due to insufficient escaping of user input, allowing attackers to inject malicious scripts into web pages.

Detection Guidance

To detect this vulnerability, check if your Joomla installation is running versions 1.5.0-5.4.8 or 6.0.0-6.1.3. Use commands like 'composer show joomla/joomla' or check the version in the Joomla admin panel. If vulnerable, upgrade to versions 5.4.9 or 6.1.4 or later.

Impact Analysis

An attacker could exploit this to execute arbitrary JavaScript in a victim's browser, potentially stealing session cookies, redirecting users to malicious sites, or performing actions on their behalf. This could lead to unauthorized data access or account compromise.

Compliance Impact

This XSS vulnerability may violate GDPR's requirement for data protection and security (Article 32) by exposing user data to unauthorized access. For HIPAA, it could compromise protected health information integrity and confidentiality if exploited in healthcare systems.

Mitigation Strategies

Update Joomla to the latest patched version to address the XSS vulnerability in HTMLHelper::link method. Remove or restrict access to vulnerable Joomla versions 1.5.0-5.4.8 and 6.0.0-6.1.3. Implement input validation and output escaping for user-supplied data.

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