Progress Sitefinity 12.1 has a Weak Password Recovery Mechanism for a Forgotten Password because the HTTP Host header is mishandled.

Sitefinity 5.1, 5.2, 5.3, 5.4, 6.x, 7.x, 8.x, 9.x, and 10.x allow remote attackers to bypass authentication and consequently cause a denial of service on load balanced sites or gain privileges via vectors related to weak cryptography.

Progress Sitefinity 10.1.6536 does not invalidate session cookies upon logouts. It instead tries to overwrite the cookie in the browser, but it remains valid on the server side. This means the cookie can be reused to maintain access to the account, even if the account credentials and permissions are changed.

Authenticate/SWT in Progress Sitefinity 9.1 has an open redirect issue in which an authentication token is sent to the redirection target, if the target is specified using a certain %40 syntax. This is fixed in 10.1.

Progress Sitefinity 9.1 has XSS via file upload, because JavaScript code in an HTML file has the same origin as the application's own code. This is fixed in 10.1.

Progress Sitefinity 9.1 has XSS via the Content Management Template Configuration (aka Templateconfiguration), as demonstrated by the src attribute of an IMG element. This is fixed in 10.1.

Progress Sitefinity 9.1 has XSS via the Last name, First name, and About fields on the New User Creation Page. This is fixed in 10.1.