Medium severity · published Sep 29, 2026
CVE-2026-92231
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
6.7
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JO
Joomla · Joomla
1.5.0-5.4.8; 6.0.0-6.1.3 · source: vendor, NVD
JF
Joomla! Framework Filter package · Joomla! Project
1.0.0-3.0.6; 4.0.0-4.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92231
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92231
product
https://www.joomla.org/
vendor-advisory
https://developer.joomla.org/security-centre/1095-20260915-core-xss-filter-bypass-in-inputfilter-via-html5-entity-decode-mismatch.html
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