Which versions of Helix Ultimate are affected by CVE-2026-57829?

A stored XSS vulnerability in JoomShaper's Helix Ultimate template framework (CVSS 8.7) allows unauthenticated attackers to inject malicious JavaScript that executes when administrators or users view…

How to fix or mitigate CVE-2026-57829?

Within 24 hours: Identify all Joomla instances running JoomShaper Helix Ultimate and inventory Joomla versions; enable detailed logging for template modifications and failed security events. Within 7 days: implement Content Security Policy (CSP) headers to restrict inline script execution, apply input validation and output encoding to all user-controllable template fields, and deploy Web Application Firewall (WAF) rules blocking known XSS payloads; restrict template editing permissions to administrative accounts only. Within 30 days: establish monitoring for JoomShaper security advisories and patch releases, evaluate patch timelines from the vendor, and assess whether to migrate to alternative template frameworks if no patch roadmap is provided.

Helix Ultimate CVE-2026-57829

Q: What is the CVSS score of CVE-2026-57829?

CVE-2026-57829 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.3%.

EUVD-2026-43302 HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-07-13 Joomla

GHSA-6r9m-9724-qfvg

XSS Helix Ultimate Extension For Joomla

8.7

CVSS 4.0 · Vendor: Joomla

Severity by source

Vendor (Joomla) PRIMARY

8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vuln.today AI

8.2 HIGH

Unauthenticated network injection (PR:N, AV:N) needing a victim to view the page (UI:R); scope changes to the victim's browser session (S:C) with high confidentiality but limited integrity and no availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Joomla).

CVSS VectorVendor: Joomla

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Jul 13, 2026 - 08:20 vuln.today

CVE Published

Jul 13, 2026 - 07:28 cve.org

HIGH 8.7

DescriptionCVE.org

The Joomla extension Helix Ultimate is vulnerable to an unauthenticated stored XSS.

AnalysisAI

Stored cross-site scripting in JoomShaper's Helix Ultimate template framework for Joomla lets unauthenticated attackers persist malicious JavaScript that executes in a victim's browser when the affected page is viewed. Because injection requires no authentication (PR:N) but relies on a victim rendering the poisoned content (UI:P), an attacker can hijack sessions, steal credentials, or perform actions as high-privilege administrators who visit the page. No public exploit identified at time of analysis and the CVE is not listed in CISA KEV.

Technical ContextAI

Helix Ultimate is a widely used template/page-builder framework for the Joomla CMS (CPE cpe:2.3:a:joomshaper.com:helix_ultimate_extension_for_joomla), providing layout, menu, and mega-menu functionality that renders site-wide, including in administrator-facing contexts. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation): user-controllable input is stored server-side and later reflected into HTML output without proper encoding or sanitization, so injected script is served as part of the trusted page. Stored XSS in a template framework is particularly impactful because the framework controls markup that is rendered across many pages rather than a single isolated endpoint.

RemediationAI

No vendor-released patch version is identified in the available data, so consult JoomShaper at https://www.joomshaper.com/joomla-templates/helixultimate for the latest Helix Ultimate release and upgrade to the newest version once a fix is published, verifying the changelog references CVE-2026-57829. As compensating controls until a confirmed patch is applied, deploy a web application firewall or Joomla security extension with XSS filtering rules to block script-bearing input to Helix Ultimate input fields (trade-off: WAF rules can be bypassed and may produce false positives on legitimate rich content), enforce a strict Content-Security-Policy that disallows inline scripts to blunt payload execution (trade-off: may break template features that rely on inline JS), and restrict access to any Helix Ultimate configuration or content-entry surfaces to trusted administrators while auditing stored template/menu content for injected markup. Absence of a listed fix version is not confirmation that no patch exists - verify current version status with the vendor.