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https://issues.apache.org/jira/browse/GUACAMOLE-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17869489#comment-17869489
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Scott Percival commented on GUACAMOLE-1972:
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Patch - https://github.com/apache/guacamole-client/pull/999
> Client incorrectly handles Unicode codepoints greater than U+FFFF
> -----------------------------------------------------------------
>
> Key: GUACAMOLE-1972
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1972
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-client
> Reporter: Scott Percival
> Priority: Minor
>
> When accepting input from the browser, Guacamole will try and convert the
> UTF-16 buffer provided by Javascript into UTF-8 bytes. However the parser
> does not take into account surrogate pairs -- meaning that any Unicode
> codepoint greater than U+FFFF (e.g. most of the emoji range) will be wrongly
> treated as two UTF-16 characters, resulting in an invalid byte sequence being
> sent to the server.
> The proposed fix is to use `String.prototype.codePointAt` instead of
> `String.prototype.charCodeAt`, along with validation that the character in
> question is a surrogate pair.
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