{"id":"CVE-2020-8421","details":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","aliases":["BIT-joomla-2020-8421"],"modified":"2026-03-14T10:34:51.292463Z","published":"2020-01-28T21:15:12.123Z","references":[{"type":"ADVISORY","url":"https://developer.joomla.org/security-centre/800-20200103-core-xss-in-com-actionlogs"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/joomla/joomla-cms","events":[{"introduced":"a2b9beda71c3603b0f0da0ab70bb30cd976ec123"},{"fixed":"e5dc4beb39b7edbbd4eec187dad7162798b77da2"}],"database_specific":{"versions":[{"introduced":"3.9.0"},{"fixed":"3.9.14"}]}}],"versions":["3.9.0","3.9.1","3.9.1-rc","3.9.10","3.9.11","3.9.11-rc","3.9.12","3.9.12-rc","3.9.13","3.9.13-rc","3.9.13-rc2","3.9.14-rc","3.9.2","3.9.2-rc","3.9.3","3.9.3-rc","3.9.4","3.9.4-rc","3.9.5","3.9.5-rc","3.9.6","3.9.6-rc","3.9.6-rc2","3.9.7","3.9.7-rc","3.9.8","3.9.9","3.9.9-rc"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8421.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}