Multiple Philippine government websites have been defaced in a recent surge of cyberattacks, raising significant concerns about national security and investor trust.

The defacement of the National Bureau of Investigation’s website over the weekend marked an escalation in a wave of attacks on Philippine government pages, with the country’s main investigative agency becoming the third major state body in less than a week to have its site compromised. The incident followed similar attacks on the Senate’s website on Wednesday and the House of Representatives’ page on Saturday, raising questions about the government’s ability to protect even its own law...