Affected versions: ≥ 5.0.0 and < 5.0.5
Full advisory: regularlabs.com
CVE-2026-85190HighCVSS 7.5Published 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.
Affected versions: ≥ 5.0.0 and < 5.0.5
Official record: cve.org · NVD
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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 CNACVSS: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:NHow 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
Affected extensions and versions
Quick Index - 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.
Affected versions: ≥ 5.0.0 and < 5.0.5
Full advisory: regularlabs.com
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Rules current as of 3 October 2026.