Kotaemon through 0.12.0 fails to properly validate conversation ownership in selectconv, deleteconv, renameconv, and onsetpublicconversation functions in control.py. Attackers can read other users' chat histories, delete conversations, or rename conversations by supplying arbitrary conversation identifiers without proper authorization checks.

kotaemon through 0.12.0 contains an insecure deserialization vulnerability in the checkconnection endpoint that allows unauthenticated attackers to instantiate arbitrary Python classes by supplying crafted YAML/JSON input with a type field. Attackers can exploit this to override the type field with subprocess.checkoutput and arbitrary arguments, achieving remote code execution with application process privileges.