XSS Vulnerability via DOM Clobbering in Dart SDK (Versions prior to 2.12.3)

CVE-2021-22540

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.

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