{"id":"CVE-2021-22540","aliases":["EUVD-2021-9681","GHSA-36mh-f84c-9fqq","GHSA-3rfv-4jvg-9522"],"status":"published","title":"XSS in Dart SDK","description":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.","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":"2026-11-11","score":0.00681,"percentile":0.52894,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2021-04-22T14:15:17Z","modified":"2026-10-20T10:54:21Z","products":[{"vendor":"dart","product":"dart_software_development_kit"},{"vendor":"google llc","product":"dart sdk"}],"references":[{"url":"https://github.com/dart-lang/sdk/security/advisories/GHSA-3rfv-4jvg-9522","tags":["x_refsource_CONFIRM","x_transferred","Broken Link","advisory"]},{"url":"https://github.com/dart-lang/sdk/commit/ce5a1c2392debce967415d4c09359ff2555e3588","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22540"},{"url":"https://github.com/advisories/GHSA-36mh-f84c-9fqq"}],"sources":{"cve":[{"id":"CVE-2021-22540","title":"XSS in Dart SDK","description":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.","status":"published","published":"2021-04-22T14:15:17Z","modified":"2024-08-03T18:44:14.025Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:58.028461Z"}],"euvd":[{"id":"EUVD-2021-9681","description":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.","status":"published","published":"2021-04-22T14:15:17Z","modified":"2024-08-03T18:44:14Z","updated_at":"2026-11-03T03:25:02.042856Z"}],"ghsa":[{"id":"GHSA-36mh-f84c-9fqq","title":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS...","description":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.","status":"published","published":"2022-05-24T17:48:09Z","modified":"2023-01-29T05:06:01Z","cwes":["CWE-79"],"updated_at":"2026-11-02T14:45:55.677123Z"}],"nvd":[{"id":"CVE-2021-22540","description":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.","status":"published","published":"2021-04-22T15:15:07.93Z","modified":"2026-06-17T03:37:24.327Z","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":"2026-11-02T14:06:52.03307Z"}],"osv":[{"id":"CVE-2021-22540","description":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.","status":"published","published":"2021-04-22T15:15:07.93Z","modified":"2026-10-20T10:54:21.520726335Z","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":"2026-11-02T15:44:18.367807Z"}]}}