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

> Privileged stored XSS in Quick Index extension allows attackers to inject malicious scripts via unescaped class attributes, potentially leading to account takeover.

- **Severity:** 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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-2722-5gxq-8j64

## What is CVE-2026-85190?

CVE-2026-85190 is a high-severity cross-site scripting vulnerability in regularlabs.com Quick Index (Free, Pro) extension for Joomla, published on 14 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-85190?


## How do I fix CVE-2026-85190?

No fix has been published for CVE-2026-85190 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85190 being exploited?

There is no known exploitation of CVE-2026-85190 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85190 and fix it if it is affected.

What it is: CVE-2026-85190 is a high-severity cross-site scripting vulnerability in regularlabs.com Quick Index (Free, Pro) extension for Joomla, published on 14 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-85190 in the wild and no public exploit code.

Affected product: regularlabs.com Quick Index (Free, Pro) extension for Joomla. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-85190/ (Markdown: https://insights.sbomify.com/CVE-2026-85190/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85190
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85190
- OSV: https://osv.dev/vulnerability/CVE-2026-85190

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-85190/
Summaries are generated and may contain mistakes; the official description above is the record.