The FBI is warning that hackers claiming to be ISIS sympathizers are attacking websites with security vulnerabilities in WordPress plugins.
PC World reports that some of the plugins were providing an easy back door for some hackers to gain access and inject scripts or install malware.
The hackers targeted news organizations, religious institutions, government websites and businesses, PC World wrote.
“Although the defacements demonstrate low-level hacking sophistication, they are disruptive and often costly in terms of lost business revenue and expenditures on technical services to repair infected computer systems,” the advisory said.
The hacking is particularly concerning because the perpetrators are voicing support for ISIS “to gain more notoriety than the underlying attack would have otherwise garnered,” the FBI said.