https://bugzilla.wikimedia.org/show_bug.cgi?id=23642
Summary: mime of some xls files are incorrectly detect as
application/zip
Product: MediaWiki
Version: 1.14.0
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Normal
Component: Uploading
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
According to, includes/MimeMagic.php
// Check for ZIP (before getimagesize)
if ( strpos( $tail, "PK\x05\x06" ) !== false ) {
wfDebug( __METHOD__.": ZIP header present at end of
$file\n" );
return $this->detectZipType( $head );
}
Some xls (ms excel) files contain "PK\x05\x06", so it incorrectly detect as zip
file and not pass filetype checking.
Here is the debugging message shown by $wgDebugComments=true,
mime: <application/zip> extension: <xls>
UploadForm::verifyExtension: mime type application/zip mismatches file
extension xls, rejecting file
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