Seafile is an open source cloud storage system. A sync token is used in Seafile file syncing protocol to authorize access to library data. To improve performance, the token is cached in memory in seaf-server. Upon receiving a token from sync client or SeaDrive client, the server checks whether the token exist in the cache. However, if the token exists in cache, the server doesn't check whether it's associated with the specific library in the URL. This vulnerability makes it possible to use any valid sync token to access data from any known library. Note that the attacker has to first find out the ID of a library which it has no access to. The library ID is a random UUID, which is not possible to be guessed. There are no workarounds for this issue.

Seafile Server before 3.1.2 and Server Professional Edition before 3.1.0 allow local users to gain privileges via vectors related to ccnet handling user accounts.

The next parameter in the /accounts/login endpoint of Seafile 9.0.6 allows attackers to redirect users to arbitrary sites.

An XSS issue in wiki and discussion pages in Seafile 9.0.6 allows attackers to inject JavaScript into the Markdown editor.