Is CVE-2026-90915 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-90915 being exploited in the wild.

How severe is CVE-2026-90915?

Informational severity, published 29 September 2026.

Which products and versions are affected?

Joomla! Joomla CMS 4.0.0-5.4.8, 6.0.0-6.1.3.

Is there a fix for CVE-2026-90915?

A patch was published on 2026-09-25: Fix released in versions 5.4.9 and 6.1.4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-90915 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-90915?

Check whether you run Joomla! 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-2026-90915: Joomla Core arbitrary directory deletion via cache purge

CVE-2026-90915 · Severity: info · Published 2026-09-29

Joomla is a widely-used content management system that powers millions of websites. A vulnerability in its caching layer allows an attacker to delete arbitrary directories on the server through improper path validation in the cache purge function. A successful exploit could result in data loss, website unavailability, or further system compromise.

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

Quick answers

Is CVE-2026-90915 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-90915 being exploited in the wild.
How severe is CVE-2026-90915?: Informational severity, published 29 September 2026.
Which products and versions are affected?: Joomla! Joomla CMS 4.0.0-5.4.8, 6.0.0-6.1.3.
Is there a fix for CVE-2026-90915?: A patch was published on 2026-09-25: Fix released in versions 5.4.9 and 6.1.4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-90915 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-90915?: Check whether you run Joomla! 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

The vulnerability is a path traversal flaw in the cache group name validation within Joomla's file-based caching layer. Improper sanitization of the cache group parameter allows attackers to craft requests that delete arbitrary directories outside the intended cache directory. The attack vector and preconditions (whether authentication is required or network-accessible) are not fully specified, but the exploit type is confirmed as path traversal resulting in arbitrary directory deletion.

Affected products

Joomla Joomla CMS 4.0.0-5.4.8, 6.0.0-6.1.3

Timeline

2026-09-29: disclosed: Public disclosure via NVD and Joomla Security Centre
2026-09-25: patched: Fix released in versions 5.4.9 and 6.1.4

References

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