CVE-2026-85190NVD

Description

Joomla Extension - regularlabs.com - Privileged stored XSS via class option in Quick Index extension for Joomla < 5.0.5 - Quick Index inserts configurable class values into generated HTML without escaping them for an HTML attribute. A crafted value can close the intended class attribute and introduce a new attribute. Joomla's content filter cannot reliably prevent this because Quick Index creates the executable HTML after the authored plugin syntax was filtered.

Severity Level

UNKNOWN

Published Date

14/09/2026

Last Modified

15/09/2026

Exploitation Status

????

EPSS Score

0.25% (percentile 16.3%)

CVSS Base Metrics

CVSS v4 (4.0)

HIGH 7.5

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/S:N/AU:N

Weaknesses (CWE)

CWE-79 - CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected & Patched Versions

Product	Affected Versions	Patched Version
regularlabs.com Quick Index (Free, Pro) extension for Joomla	1.0.0-5.0.4	N/A

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