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CVE-2026-85190— Joomla Extension - regularlabs.com - Privileged stored XSS via class option in Quick Index extension for Joomla < 5.0.5

Quick assessment

Affected
regularlabs.com Quick Index (Free, Pro) extension for Joomla
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joomla 插件 — regularlabs.com — Quick Index 插件（适用于 Joomla < 5.0.5）通过“class”选项实现的特权型存储型 XSS 漏洞 Quick Index 插件将可配置的 值直接插入到生成的 HTML 中，且未对 HTML 属性进行转义。攻击者可以构造一个特殊的值，从而结束预设的 属性并引入新的属性。由于 Quick Index 在作者插件语法经过内容过滤器处理之后才生成可执行的 HTML，因此 Joomla 的内容过滤器无法可靠地阻止此漏洞。

CVSS 7.5 · High EPSS 0.42% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
regularlabs.com Quick Index (Free, Pro) extension for Joomla 1.0.0-5.0.4 affected
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I. Basic Information for CVE-2026-85190

Vulnerability Information
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Vulnerability Title
Joomla Extension - regularlabs.com - Privileged stored XSS via class option in Quick Index extension for Joomla < 5.0.5
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
regularlabs.com Quick Index (Free, Pro) extension for Joomla 1.0.0-5.0.4 -

II. Public POCs for CVE-2026-85190

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III. Intelligence Information for CVE-2026-85190

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Vendor Pages for CVE-2026-85190 (1)

Same Patch Batch · regularlabs.com · 2026-09-14 · 9 CVEs total

CVE-2026-85192 9.4 CRITICAL Joomla Extension - regularlabs.com - Authenticated, privileged remote code execution in Co
CVE-2026-85195 7.5 HIGH Joomla Extension - regularlabs.com - Privileged stored XSS via link option in Articles Any
CVE-2026-85191 7.5 HIGH Joomla Extension - regularlabs.com - Privileged stored XSS via rtla-alias option in Tabs &
CVE-2026-88853 7.5 HIGH Joomla Extension - regularlabs.com - Privileged stored XSS via event handler option in Mod
CVE-2026-85189 7.5 HIGH Joomla Extension - regularlabs.com - Privileged stored XSS via executable URL schemes in M
CVE-2026-88852 7.5 HIGH Joomla Extension - regularlabs.com - Privileged stored XSS via url option in Snippets Free
CVE-2026-85188 6.9 MEDIUM Joomla Extension - regularlabs.com - Database data disclosure in Advanced Module Manager (
CVE-2026-85196 5.3 MEDIUM Joomla Extension - regularlabs.com - Reflected XSS in Articles Anywhere extension for Joom

IV. Related Vulnerabilities

Same vendor: regularlabs.com
Same weakness: CWE-79