Due to build misconfiguration in openssl dependency, LINE for Windows before 7.8 is vulnerable to DLL injection that could lead to privilege escalation.
Due to the lack of media file checks before rendering, it was possible for an attacker to cause abnormal CPU consumption for message recipient by sending specially crafted gif image in LINE for Windows before 7.4.
Untrusted search path vulnerability in LINE for Windows versions before 5.8.0 allows an attacker to gain privileges via a Trojan horse DLL in an unspecified directory.