CVE-2026-100751
Received Received - Intake

Privileged Stored XSS in Tabs & Accordions Pro Joomla Extension

Publication date: 2026-09-28

Last updated on: 2026-09-28

Assigner: Joomla! Project

Description
Joomla Extension - regularlabs.com - Privileged stored XSS via data-rlta-url attributes in Tabs & Accordions (Pro) 2.3.0 - 3.1.0 - Tabs & Accordions Pro accepts a url option for an item and writes it to a generated data-rlta-url attribute. The browser code passes that value to window.open() when the item is activated. Affected versions do not reject browser URL schemes which execute JavaScript. Joomla sees ordinary plugin syntax while filtering the authored article; Tabs & Accordions creates the executable browser behavior later while rendering the article.

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Meta Information

Published
2026-09-28
Last Modified
2026-09-28
Generated
2026-09-28
AI Q&A
2026-09-28
EPSS Evaluated
N/A
NVD
CVE-2026-100751
EUVD
EUVD-2026-88105

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
regularlabs tabs_and_accordions_pro From 3.1.0 (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 Tabs & Accordions Pro extension for Joomla. It occurs because the extension accepts a URL option for items and writes it to a data-rlta-url attribute without properly filtering browser URL schemes like javascript:. When the item is activated, the browser executes the JavaScript code, leading to potential unauthorized actions or data theft.

Detection Guidance

To detect this vulnerability, inspect Joomla sites using Tabs & Accordions Pro versions 2.3.0 to 3.1.0 for data-rlta-url attributes in rendered content. Check browser console for JavaScript execution when interacting with tabs or accordions. No specific commands are provided in the context.

Impact Analysis

An attacker could exploit this to inject malicious scripts into web pages viewed by other users. This could lead to session hijacking, defacement of the website, or theft of sensitive user data such as cookies or credentials. Users with administrative privileges are particularly at risk if the injected script runs in their context.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR's data protection principles. For HIPAA, it may expose protected health information (PHI) if healthcare data is compromised. Organizations using affected Joomla extensions may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Immediately update Tabs & Accordions Pro to a version beyond 3.1.0. Disable the extension if updates are unavailable. Review and sanitize user-generated content for malicious URLs. Monitor for unusual activity in Joomla logs.

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