The upload module in Drupal 5.x before 5.23 and 6.x before 6.18 does not properly support case-insensitive filename handling in a database configuration, which allows remote authenticated users to bypass the intended restrictions on downloading a file by uploading a different file with a similar name.
References to Advisories, Solutions, and Tools
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[oss-security] 20100913 Re: CVE id requests: drupal
Advisory; Patch Information
[oss-security] 20100911 CVE id requests: drupal