# CVE-2026-90906: Joomla Core cross-site scripting in HTMLHelper::link method

Source: https://junglewise.ai/threats/cve-2026-90906-joomla-core-20260901-xss-in-htmlhelper-link-method-in-joomla-1-5  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-29. Updated: 2026-09-29  
License: CC BY 4.0 with a link back

CVE-2026-90906 · Severity: info · Published 2026-09-29

Joomla is a popular open-source content management system used to build websites and online applications. A cross-site scripting (XSS) vulnerability in the HTML helper link method allows attackers to inject malicious scripts that execute in the browsers of site visitors, potentially stealing sessions, credentials, or sensitive data. The vulnerability affects Joomla versions 1.5.0 through 5.4.8 and 6.0.0 through 6.1.3.

Technologies: [Joomla! Joomla\!](https://junglewise.ai/threats/technologies/joomla). Vendors: [Joomla!](https://junglewise.ai/threats/vendors/joomla).

## Quick answers

**Is CVE-2026-90906 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90906 being exploited in the wild.

**How severe is CVE-2026-90906?** Informational severity, published 29 September 2026.

**Which products and versions are affected?** Joomla! Joomla\! 1.5.0-5.4.8, 6.0.0-6.1.3.

**Is there a fix for CVE-2026-90906?** A patch was published on 2026-09-25. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-90906 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-90906?** Check whether you run Joomla! Joomla\! at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The HTMLHelper::link method fails to properly escape output, leading to stored or reflected XSS. An attacker can inject malicious JavaScript through link parameters that are not sanitized before rendering in HTML. Fixes are available in versions 5.4.9 and 6.1.4.

## Affected products

- Joomla Joomla 1.5.0-5.4.8, 6.0.0-6.1.3

## Timeline

- 2026-09-29: disclosed
- 2026-09-25: patched

## References

- [https://developer.joomla.org/security-centre/1081-20260901-core-xss-in-htmlhelper-link-method.html](https://developer.joomla.org/security-centre/1081-20260901-core-xss-in-htmlhelper-link-method.html)
- [https://www.joomla.org/](https://www.joomla.org/)

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