Is CVE-2026-92231 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-92231 being exploited in the wild.

How severe is CVE-2026-92231?

Informational severity, published 29 September 2026.

Which products and versions are affected?

Joomla! Joomla\! 1.5.0–5.4.8, 6.0.0–6.1.3.

Is there a fix for CVE-2026-92231?

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-2026-92231 attacked?

It is attacked over the network.

Am I affected by CVE-2026-92231?

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.

CVE-2026-92231: Joomla Core XSS filter bypass in InputFilter via HTML5 entity decode

CVE-2026-92231 · Severity: info · Published 2026-09-29

Joomla is a widely-used content management system that powers millions of websites. A flaw in its input filter allows attackers to bypass XSS protections by exploiting incomplete HTML5 entity decoding in attribute validation, potentially enabling unauthorized script execution on vulnerable sites.

Technologies: Joomla! Joomla\!. Vendors: Joomla!.

Quick answers

Is CVE-2026-92231 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-92231 being exploited in the wild.
How severe is CVE-2026-92231?: Informational severity, published 29 September 2026.
Which products and versions are affected?: Joomla! Joomla\! 1.5.0–5.4.8, 6.0.0–6.1.3.
Is there a fix for CVE-2026-92231?: 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-2026-92231 attacked?: It is attacked over the network.
Am I affected by CVE-2026-92231?: 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

The checkAttribute method in Joomla's InputFilter normalizes attribute values before testing them against a "javascript:" scheme regex, but fails to decode HTML5 entities before the check, allowing encoded payloads to bypass the filter. An attacker can inject HTML5 entity-encoded javascript: URIs into attributes, which normalize to valid scheme but are not caught by the regex. The vulnerability affects versions 1.5.0–5.4.8 and 6.0.0–6.1.3; patches were released on 2026-09-25.

Affected products

Joomla Joomla 1.5.0–5.4.8, 6.0.0–6.1.3

Timeline

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

References

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