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.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-85190 being exploited?
There is no known exploitation of CVE-2026-85190 in the wild and no public exploit code.
Sources
Also known as GHSA-2722-5gxq-8j64.