The exec_command function in common/helpers.py in Gajim before 0.15 allows user-assisted remote attackers to execute arbitrary commands via shell metacharacters in an href attribute.

SQL injection vulnerability in the get_last_conversation_lines function in common/logger.py in Gajim before 0.15 allows remote attackers to execute arbitrary SQL commands via the jig parameter.

src/common/latex.py in Gajim 0.15 allows local users to overwrite arbitrary files via a symlink attack on a temporary latex file, related to the get_tmpfile_name function.

The _ssl_verify_callback function in tls_nb.py in Gajim before 0.15.3 does not properly verify SSL certificates, which allows remote attackers to conduct man-in-the-middle (MITM) attacks and spoof servers via an arbitrary certificate from a trusted CA.

Gajim before 0.16.5 allows remote attackers to modify the roster and intercept messages via a crafted roster-push IQ stanza.

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.