Is CVE-2026-48954 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-48954 being exploited in the wild.

How severe is CVE-2026-48954?

Informational severity, with a CVSS score of 5.9, published 7 July 2026.

Which products and versions are affected?

Joomla! Project Joomla! CMS 3.0.0 - 5.4.6, 6.0.0 - 6.1.1.

Is there a fix for CVE-2026-48954?

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-2026-48954 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-48954?

Check whether you run Joomla! Project Joomla! CMS 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.

CVE-2026-48954: Joomla! CMS XSS in language override feature

CVE-2026-48954 · Severity: info · CVSS 5.9 · Published 2026-07-07

Joomla! CMS, a popular platform for building and managing websites, contains a security vulnerability in its language override feature. This feature allows administrators to customize text strings used throughout the site. An attacker with high-level administrative privileges could exploit this to inject malicious scripts, potentially leading to unauthorized actions or data theft when other users interact with the affected administrative interface.

Technologies: Joomla! Project Joomla! CMS. Vendors: Joomla! Project.

Quick answers

Is CVE-2026-48954 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-48954 being exploited in the wild.
How severe is CVE-2026-48954?: Informational severity, with a CVSS score of 5.9, published 7 July 2026.
Which products and versions are affected?: Joomla! Project Joomla! CMS 3.0.0 - 5.4.6, 6.0.0 - 6.1.1.
Is there a fix for CVE-2026-48954?: 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-2026-48954 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-48954?: Check whether you run Joomla! Project Joomla! CMS 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 stored cross-site scripting (XSS) vulnerability exists in Joomla! CMS versions 3.0.0 through 5.4.6 and 6.0.0 through 6.1.1. The flaw is located in the language override component, where the application fails to properly validate or sanitize user-supplied input before it is stored and rendered. An attacker with high privileges (PR:H) can inject malicious JavaScript into language strings. The exploit requires a victim to interact with the modified language string (UI:P). Successful exploitation could allow for session hijacking or the execution of arbitrary actions in the context of the victim's browser. The issue is resolved in versions 5.4.7 and 6.1.2.

Affected products

Joomla! Project Joomla! CMS 3.0.0 - 5.4.6, 6.0.0 - 6.1.1

Timeline

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

References

https://developer.joomla.org/security-centre/1062-20260708-core-xss-through-language-overrides.html

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