WASHINGTON — Congress is once again pushing forward on a controversial bill to bolster the nation’s cybersecurity, which could end up changing how law firms and their clients respond to online threats.

The House passed the Cyber Intelligence Sharing and Protection Act, known as CISPA, on Thursday, sending the legislation to the Senate. The bill would allow "cybersecurity entities" — an intentionally broad term that includes law firms and business that they represent — to share cyberthreat information with the intelligence community.