{"id":"CVE-2021-26035","aliases":["BIT-joomla-2021-26035","EUVD-2021-12858","GHSA-2vpx-cqm4-rqhq"],"status":"published","title":"[20210701] - Core - XSS in JForm Rules field","description":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.","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":"2026-11-10","score":0.00723,"percentile":0.54345,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-07-07T10:12:45Z","modified":"2026-10-24T10:30:36Z","affected":[{"source":"osv","ecosystem":"Bitnami","package":"joomla","ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"last_affected":"3.9.27"}]}]}],"products":[{"vendor":"joomla","product":"joomla\\!"},{"vendor":"joomla! project","product":"joomla! cms"}],"references":[{"url":"https://developer.joomla.org/security-centre/856-20210701-core-xss-in-jform-rules-field.html","tags":["x_refsource_MISC","vendor-advisory","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26035","tags":["web"]},{"url":"https://github.com/advisories/GHSA-2vpx-cqm4-rqhq"}],"sources":{"cve":[{"id":"CVE-2021-26035","title":"[20210701] - Core - XSS in JForm Rules field","description":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.","status":"published","published":"2021-07-07T10:12:45.054Z","modified":"2026-02-25T05:05:49.34Z","updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-12858","description":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.","status":"published","published":"2021-07-07T10:12:45Z","modified":"2026-02-25T05:05:49Z","updated_at":"2026-11-02T19:48:29.551855Z"}],"ghsa":[{"id":"GHSA-2vpx-cqm4-rqhq","title":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field...","description":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.","status":"published","published":"2022-05-24T19:07:08Z","modified":"2023-01-30T05:00:38Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:46:14.926249Z"}],"nvd":[{"id":"CVE-2021-26035","description":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.","status":"published","published":"2021-07-07T11:15:08.603Z","modified":"2026-06-17T03:42:46.557Z","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":"2026-11-02T14:06:55.259633Z"}],"osv":[{"id":"CVE-2021-26035","description":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.","status":"published","published":"2021-07-07T11:15:08.603Z","modified":"2026-10-24T10:30:36.882351168Z","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":"2026-11-02T15:44:18.778776Z"},{"id":"BIT-joomla-2021-26035","title":"[20210701] - Core - XSS in JForm Rules field","description":"An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.","status":"published","published":"2025-04-03T14:13:30.589Z","modified":"2026-09-08T08:48:01.41614764Z","updated_at":"2026-11-02T15:28:31.782692Z"}]}}