CVE-2026-92231
HighCVSS 7.1Summary
Joomla! Core versions 1.5.0-5.4.8 and 6.0.0-6.1.3 have an XSS filter bypass in InputFilter due to an HTML5 entity decode mismatch. The checkAttribute method normalizes an attribute value before testing it against the "javascript:" scheme regex, but without decoding HTML5 entities beforehand, causing an XSS vector.
Risk Assessment
The vulnerability allows an attacker to inject JavaScript through specially crafted attributes, potentially leading to session hijacking or unauthorized actions in the user's context.
Recommendation
Upgrade Joomla! to a patched version. Also apply additional security measures such as Content Security Policy.
Other vulnerabilities in Joomla!
See all- CVE-2026-92232High
Joomla! Core versions 1.5.0-5.4.8 and 6.0.0-6.1.3 have an XSS filter bypass in InputFilter. The cleanAttribute method removes HTML data URIs, but injected whitespace characters can circumvent that cleanup, causing an XSS vector.
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Original NVD description (English source)
Joomla! Core - [20260915] - Core - XSS filter bypass in InputFilter via HTML5 entity decode mismatch in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3 - The checkAttribute method normalized an attribute value before testing it against the "javascript:" scheme regex, however without decoding HTML5 entities beforehand, causing an XSS vector.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS