lib/MT/Upgrade.pm in mt-upgrade.cgi in Movable Type 4.2x and 4.3x through 4.38 does not require authentication for requests to database-migration functions, which allows remote attackers to conduct eval injection and SQL injection attacks via crafted parameters, as demonstrated by an eval injection attack against the coredropmetafortable function, leading to execution of arbitrary Perl code.

Unspecified vulnerability in Movable Type 4.x before 4.36 and 5.x before 5.05 allows remote attackers to read or modify data via unknown vectors.

Cross-site scripting (XSS) vulnerability in Movable Type 4.x before 4.36 and 5.x before 5.05 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Movable Type before 4.38, 5.0x before 5.07, and 5.1x before 5.13 allows remote attackers to take control of sessions via unspecified vectors related to the (1) commenting feature and (2) community script.

Multiple cross-site request forgery (CSRF) vulnerabilities in Movable Type before 4.38, 5.0x before 5.07, and 5.1x before 5.13 allow remote attackers to hijack the authentication of arbitrary users for requests that modify data via the (1) commenting feature or (2) community script.

Cross-site scripting (XSS) vulnerability in mt-wizard.cgi in Six Apart Movable Type 4.24, and 4.25 when global templates are not initialized, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.