The (1) rdiff and (2) preview scripts in TWiki 4.0 and 4.0.1 ignore access control settings, which allows remote attackers to read restricted areas and access restricted content in TWiki topics.

Eval injection vulnerability in the configure script in TWiki 4.0.0 through 4.0.4 allows remote attackers to execute arbitrary Perl code via an HTTP POST request containing a parameter name starting with "TYPEOF".

Cross-site request forgery (CSRF) vulnerability in TWiki before 4.3.2 allows remote attackers to hijack the authentication of arbitrary users for requests that update pages, as demonstrated by a URL for a save script in the ACTION attribute of a FORM element, in conjunction with a call to the submit method in the onload attribute of a BODY element. NOTE: this issue exists because of an insufficient fix for CVE-2009-1339.

TWiki 4.0.0, 4.0.1, and 4.0.2 allows remote attackers to gain Twiki administrator privileges via a TWiki.TWikiRegistration form with a modified action attribute that references the Sandbox web instead of the user web, which can then be used to associate the user's login name with the WikiName of a member of the TWikiAdminGroup.

Directory traversal vulnerability in viewfile in TWiki 4.0.0 through 4.0.4 allows remote attackers to read arbitrary files via a .. (dot dot) in the filename parameter.

Unspecified vulnerability in Twiki 4.0.0 through 4.1.0 allows local users to execute arbitrary Perl code via unknown vectors related to CGI session files.

TWiki 4.0, 4.0.1, and 20010901 through 20040904 allows remote authenticated users with edit rights to cause a denial of service (infinite recursion leading to CPU and memory consumption) via INCLUDE by URL statements that form a loop, such as a page that includes itself.

TWiki 01-Dec-2000 up to 4.0.3 allows remote attackers to bypass the upload filter and execute arbitrary code via filenames with double extensions such as ".php.en", ".php.1", and other allowed extensions that are not .txt. NOTE: this is only a vulnerability when the server allows script execution in the pub directory.