An issue was discovered in Gajim through 1.4.7. The vulnerability allows attackers, via crafted XML stanzas, to correct messages that were not sent by them. The attacker needs to be part of the group chat or single chat. The fixed version is 1.5.0.
Gajim through 0.16.7 unconditionally implements the "XEP-0146: Remote Controlling Clients" extension. This can be abused by malicious XMPP servers to, for example, extract plaintext from OTR encrypted sessions.