CVE-2026-78077
Received Received - Intake

Stored XSS in Helix Ultimate Joomla Extension

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: Joomla! Project

Description
Joomla Extension - joomshaper.com - Stored Cross-Site Scripting (XSS) in MegaMenu Layout Container & Embed Inputs in Helix Ultimate < 2.2.10 - Unsanitized column and item configuration values stored within the MegaMenu layout JSON were rendered without complete contextual escaping, allowing injection of malicious HTML/JS. Stricter sanitization and tag allowlists via `InputFilter` and `htmlspecialchars` were implemented.

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Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-08-31
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
CVE-2026-78077
EUVD
EUVD-2026-68524

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
joomla helix_ultimate to 2.2.10 (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 Joomla extension Helix Ultimate versions before 2.2.10. Unsanitized column and item configuration values in the MegaMenu layout JSON are stored and later rendered without proper escaping, enabling malicious HTML or JavaScript injection.

Detection Guidance

Check Joomla extensions for Helix Ultimate versions below 2.2.10. Inspect MegaMenu layout JSON configurations for unsanitized inputs. Look for stored XSS payloads in column/item values rendered in HTML output.

Impact Analysis

An attacker could inject malicious scripts into web pages viewed by users. This may lead to theft of session cookies, account takeover, or defacement of the website. Users with access to the MegaMenu configuration could exploit this to execute arbitrary code.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's integrity and confidentiality requirements or HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties and reputational damage.

Mitigation Strategies

Update Helix Ultimate to version 2.2.10 or later. Review and sanitize MegaMenu layout configurations. Apply stricter InputFilter and htmlspecialchars sanitization to prevent XSS injection.

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