# CVE-2026-90914: Joomla Core XSS in generic media output layouts

Source: https://junglewise.ai/threats/cve-2026-90914-joomla-core-20260904-core-xss-in-the-generic-media-output-layouts  
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-2026-90914 · Severity: info · Published 2026-09-29

Joomla is a widely-used content management system that powers millions of websites. An XSS vulnerability in the audio and video output layouts allows attackers to inject malicious scripts into web pages viewed by administrators and visitors. This could lead to account compromise, data theft, or malware distribution depending on the attacker's intent and the site's configuration.

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

## Quick answers

**Is CVE-2026-90914 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90914 being exploited in the wild.

**How severe is CVE-2026-90914?** Informational severity, published 29 September 2026.

**Which products and versions are affected?** Joomla! Joomla\! 4.0.0-5.4.8, 6.0.0-6.1.3.

**Is there a fix for CVE-2026-90914?** 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-2026-90914 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-90914?** 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

A lack of output escaping in the generic audio and video media layout components allows cross-site scripting (XSS) attacks. The vulnerability affects Joomla versions 4.0.0-5.4.8 and 6.0.0-6.1.3. Attackers with the ability to control media content or URLs can inject arbitrary JavaScript that executes in the context of administrators or other users viewing the affected layouts; patches are available in versions 5.4.9 and 6.1.4.

## Affected products

- Joomla Joomla 4.0.0-5.4.8, 6.0.0-6.1.3

## Timeline

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

## References

- [https://developer.joomla.org/security-centre/1084-20260904-core-xss-in-the-generic-media-output-layouts.html](https://developer.joomla.org/security-centre/1084-20260904-core-xss-in-the-generic-media-output-layouts.html)
- [https://www.joomla.org/](https://www.joomla.org/)

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- [Joomla Core XSS filter bypass in InputFilter via HTML5 entity decode](https://junglewise.ai/threats/cve-2026-92231-joomla-core-20260915-core-xss-filter-bypass-in-inputfilter-via)
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