{"id":"CVE-2026-85190","title":"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","summary":"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 cr…","severity":"high","cvss":7.5,"cvssVector":"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","cwe":["CWE-79"],"vendor":"regularlabs.com","product":"plg_system_quickindex","affected":["plg_system_quickindex 1.0.0-5.0.4"],"published":"2026-09-14","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:28:06.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85190","references":[{"url":"https://www.regularlabs.com/","label":"security@joomla.org"}],"tags":["nvd","cve.org"],"epss":0.00418,"epssPercentile":0.33329,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-14T11:32:05.952147Z"},"cvssSource":"cna","ingestedAt":"2026-09-14T15:23:07.453Z","slug":"CVE-2026-85190","body":"## Overview\n\nJoomla 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}