Movim prior to version 0.22 is affected by a Cross-Site WebSocket Hijacking vulnerability. This was the result of a missing header validation.

An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. This allows for various kinds of social engineering attacks. This CVE is for Movim 0.8 - 0.10.