CVE-2026-85190
Received Received - Intake

Privileged Stored XSS in Quick Index Joomla Extension

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Joomla! Project

Description
Joomla Extension - regularlabs.com - Privileged stored XSS via class option in Quick Index extension for Joomla < 5.0.5 - Quick Index inserts configurable class values into generated HTML without escaping them for an HTML attribute. A crafted value can close the intended class attribute and introduce a new attribute. Joomla's content filter cannot reliably prevent this because Quick Index creates the executable HTML after the authored plugin syntax was filtered.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-85190
EUVD
EUVD-2026-77314

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
regularlabs quick_index to 5.0.5 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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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.

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Executive Summary

This is a stored Cross-Site Scripting (XSS) vulnerability in the Quick Index extension for Joomla versions below 5.0.5. The flaw allows attackers with privileged access to inject malicious scripts via class option parameters. The extension inserts user-controlled class values into HTML without proper escaping, enabling attackers to close the class attribute and introduce new malicious attributes.

Impact Analysis

An attacker could exploit this to execute arbitrary JavaScript in the context of other users' browsers, potentially stealing session cookies, performing actions on their behalf, or defacing the website. Since it is a stored XSS, the attack persists and affects all users who view the compromised content.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles. For HIPAA, it may risk exposing protected health information. Compliance failures could result in legal penalties, reputational damage, and mandatory breach notifications.

Mitigation Strategies

Update the Quick Index extension for Joomla to version 5.0.5 or higher to address the privileged stored XSS vulnerability.

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