Is CVE-2026-90917 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-90917 being exploited in the wild.

How severe is CVE-2026-90917?

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-2026-90917?

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

How is CVE-2026-90917 attacked?

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

Am I affected by CVE-2026-90917?

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-2026-90917: Joomla Core improper ACL checks in tagged items

CVE-2026-90917 · Severity: info · Published 2026-09-29

Joomla is a popular open-source content management system used to build websites and manage digital content. An improper access control flaw allows unauthorized users to view content items that belong to categories they should not have access to. This could result in exposure of sensitive or restricted content to users who lack proper permissions.

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

Quick answers

Is CVE-2026-90917 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-90917 being exploited in the wild.
How severe is CVE-2026-90917?: 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-2026-90917?: A patch was published on 2026-09-25: Versions 5.4.9 and 6.1.4 available Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-90917 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-90917?: 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

An improper ACL (access control list) check in the tagged items output mechanism allows unauthorized users to bypass category-level access restrictions. The vulnerability exists in Joomla 4.0.0–5.4.8 and 6.0.0–6.1.3, and does not require authentication or special exploitation conditions. A fix is available by upgrading to versions 5.4.9 or 6.1.4.

Affected products

Joomla Joomla CMS 4.0.0–5.4.8, 6.0.0–6.1.3

Timeline

2026-09-29: disclosed
2026-09-25: patched: Versions 5.4.9 and 6.1.4 available

References

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