Telligent Community Server 2.1 and earlier allows remote attackers to cause a denial of service (bandwidth or thread consumption) via pingback service calls with a source URI that corresponds to (1) a large file, which triggers a long download session without a timeout constraint; or (2) a file with a binary content type, which is downloaded even though it cannot contain usable pingback data.

Cross-site scripting (XSS) vulnerability in SearchResults.aspx in Community Forum allows remote attackers to inject arbitrary web script or HTML via the q parameter.