The latest zero-day vulnerability in the Opera Web browser highlights the fact that all Web browser clients are insecure by nature, says security services firm Idappcom.

Haywood said the latest Opera vulnerability allows potential attackers to execute arbitrary code remotely.

The flaw was discovered by French security researcher Jordi Chancel, who disclosed it earlier this month and classified the problem as an integer truncation error.

Although Opera is relatively low-profile and has a select user base, it still represents millions of users, said Anthony Haywood, chief technology officer at Idappcom.