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CVE-2026-85190HighCVSS 7.5CVE published 14 September 2026Added to mySites.guru 13 September 2026

Quick Index (quickindex) 5.0.0 to below 5.0.5 - Authenticated Stored XSS via Crafted Index Class Options

Regular Labs Quick Index 5.0.0 through 5.0.4 is affected by CVE-2026-85190, fixed in 5.0.5 (released 13 September 2026). Crafted index class options were not sanitised, allowing JavaScript to be injected into the rendered index. Exploitation requires the ability to author or edit content containing a Quick Index tag, so this is an authenticated stored XSS. Update to 5.0.5 or later. The same release also fixes indexes showing headings from articles the visitor cannot access, an access control defect the vendor did not label a security fix but which discloses restricted article titles to unauthorised visitors. The CVE record was published on 14 September 2026 with a CVSS 4.0 base score of 7.5 (High), vector 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.

Is my site affected?

Affected
Quick Index from 5.0.0 up to but not including 5.0.5
Fixed in
5.0.5
What to do
Update Quick Index to 5.0.5 or later.
Check whether your sites are affected

How CVE-2026-85190 is scored

The base metrics as Joomla CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

7.5 High

CVSS 4.0, scored by Joomla CNA
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

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
AT:P Attack requirements
Present. Needs a particular deployment or race to line up
PR:H Privileges required
High. Needs an account with elevated rights
UI:N User interaction
None. Nobody has to be tricked into anything

What it does to the site

VC:H Confidentiality
High. Everything the site holds can be read
VI:H Integrity
High. Data and files can be altered at will
VA:L Availability
Low. The site slows or stutters

What it does beyond the site

SC:N Confidentiality
None. Other systems keep their data
SI:N Integrity
None. Other systems keep their integrity
SA:N Availability
None. Other systems stay up

Timeline

  1. 13 September 2026mySites.guru check added for Quick Index (from 5.0.0 up to but not including 5.0.5)
  2. 14 September 2026CVE-2026-85190 record published by its CNA

Rule details

Other vulnerabilities in Quick Index and Quick Index

Updating for CVE-2026-85190 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extensions.

Quick Index

Latest safe version: 5.0.5

Quick Index

Latest safe version: 5.0.5

References

CVE-2026-85190 questions

Which versions are affected by CVE-2026-85190?
CVE-2026-85190 affects Quick Index from 5.0.0 up to but not including 5.0.5. The fix is in 5.0.5.
How do I fix CVE-2026-85190?
Update Quick Index to 5.0.5 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-85190?
Joomla CNA scores it 7.5 (High) under CVSS 4.0. In plain terms: reachable across the internet, needs an account with elevated rights and nobody has to be tricked into anything.

Running an affected version on a site you manage?

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This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 13 October 2026.