lib/TWiki/Sandbox.pm in TWiki 6.0.0 and earlier, when running on Windows, allows remote attackers to bypass intended access restrictions and upload files with restricted names via a null byte (%00) in a filename to bin/upload.cgi, as demonstrated using .htaccess to execute arbitrary code.
%7Cutmcsr%3D(direct)%7Cutmcmd%3D(none)){kind=small}
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