# CVE-2026-48953: Joomla! CMS XSS in generic image output layout

Source: https://junglewise.ai/threats/cve-2026-48953-joomla-cms-xss-in-generic-image-output-layout  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-07. Updated: 2026-07-07  
License: CC BY 4.0 with a link back

CVE-2026-48953 · Severity: info · CVSS 5.9 · Published 2026-07-07

Joomla! CMS, a popular website management platform, contains a security flaw in how it handles image displays. An attacker with high-level administrative privileges could use this to inject malicious scripts into the website. If triggered by another user, this could lead to unauthorized actions or data theft within the management console.

## Quick answers

**Is CVE-2026-48953 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-48953 being exploited in the wild.

**How severe is CVE-2026-48953?** Informational severity, with a CVSS score of 5.9, published 7 July 2026.

**Which products and versions are affected?** Joomla! Project Joomla! CMS 4.0.0-5.4.6, 6.0.0-6.1.1.

**Is there a fix for CVE-2026-48953?** A patch was published on 2026-07-07: Fixed in versions 5.4.7 and 6.1.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-48953 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-48953?** Check whether anything you run is named in the advisory. 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 stored cross-site scripting (XSS) vulnerability exists in the Joomla! CMS core within the generic image output layout. The issue stems from insufficient output escaping of image-related data. An attacker with high privileges (PR:H) can exploit this over the network to inject malicious scripts. Execution occurs when a victim views the affected layout, potentially allowing for session hijacking or unauthorized administrative actions. The vulnerability affects versions 4.0.0 through 5.4.6 and 6.0.0 through 6.1.1, and is resolved in versions 5.4.7 and 6.1.2.

## Affected products

- Joomla! Project Joomla! CMS 4.0.0-5.4.6, 6.0.0-6.1.1

## Timeline

- 2026-05-15: other: Reported date
- 2026-07-07: patched: Fixed in versions 5.4.7 and 6.1.2
- 2026-07-07: advisory: Public advisory published

## References

- [https://developer.joomla.org/security-centre/1061-20260707-core-xss-in-the-generic-image-output-layout.html](https://developer.joomla.org/security-centre/1061-20260707-core-xss-in-the-generic-image-output-layout.html)