UI/Manage.pm in Foswiki 1.1.0 and 1.1.1 allows remote authenticated users to gain privileges by modifying the GROUP and ALLOWTOPICCHANGE preferences in the topic preferences for Main.AdminGroup.
Multiple cross-site scripting (XSS) vulnerabilities in UI/Register.pm in Foswiki before 1.1.5 allow remote authenticated users with CHANGE privileges to inject arbitrary web script or HTML via the (1) text, (2) FirstName, (3) LastName, (4) OrganisationName, (5) OrganisationUrl, (6) Profession, (7) Country, (8) State, (9) Address, (10) Location, (11) Telephone, (12) VoIP, (13) InstantMessagingIM, (14) Email, (15) HomePage, or (16) Comment parameter. NOTE: some of these details are obtained from third party information.