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 - The checkAttribute…

PriorityP335medium6.7CVSS 3.1

AVNACLPRHUINSUCHIHAL

EPSS

0.27%

17.9th percentile

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.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
joomla!_project	joomla!_cms	—	—
joomla!_project	joomla!_cms	—	—
joomla!_project	joomla!_framework_filter_package	—	—
joomla!_project	joomla!_framework_filter_package	—	—
joomla	joomla_!	>= 1.5.0 < 5.4.8	5.4.8
joomla	joomla_!	>= 6.0.0 < 6.1.3	6.1.3

CVSS provenance

nvdv3.16.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

nvdv4.07.1HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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