{"id":"CVE-2020-8421","aliases":["BIT-joomla-2020-8421","EUVD-2020-29288","GHSA-m4hj-w5c6-qqv3"],"status":"published","title":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS...","description":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01015,"percentile":0.63522,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2020-01-28T20:58:34Z","modified":"2026-10-24T10:30:25Z","fixes":[{"ecosystem":"Bitnami","package":"joomla","fixed_in":["3.9.14"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"joomla","ranges":[{"type":"SEMVER","events":[{"introduced":"3.9.0"},{"fixed":"3.9.14"}]}]}],"products":[{"vendor":"joomla","product":"joomla\\!"}],"references":[{"url":"https://developer.joomla.org/security-centre/800-20200103-core-xss-in-com-actionlogs","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8421","tags":["web"]},{"url":"https://github.com/advisories/GHSA-m4hj-w5c6-qqv3"}],"sources":{"cve":[{"id":"CVE-2020-8421","description":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","status":"published","published":"2020-01-28T20:58:34Z","modified":"2024-08-04T09:56:28.347Z","updated_at":"2026-11-02T14:35:50.545879Z"}],"euvd":[{"id":"EUVD-2020-29288","description":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","status":"published","published":"2020-01-28T20:58:34Z","modified":"2024-08-04T09:56:28Z","updated_at":"2026-11-03T03:07:57.599144Z"}],"ghsa":[{"id":"GHSA-m4hj-w5c6-qqv3","title":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS...","description":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","status":"published","published":"2022-05-24T17:07:39Z","modified":"2023-01-29T05:01:25Z","updated_at":"2026-11-02T14:44:48.898243Z"}],"nvd":[{"id":"CVE-2020-8421","description":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","status":"published","published":"2020-01-28T21:15:12.123Z","modified":"2026-06-17T03:26:21.11Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:05:53.837808Z"}],"osv":[{"id":"CVE-2020-8421","description":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","status":"published","published":"2020-01-28T21:15:12.123Z","modified":"2026-10-24T10:30:25.097196926Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:17.663289Z"},{"id":"BIT-joomla-2020-8421","description":"An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.","status":"published","published":"2025-04-03T14:11:45.995Z","modified":"2026-09-08T08:48:01.747755303Z","updated_at":"2026-11-02T15:28:31.782692Z"}]}}