Changing your password regularly and using a strong password are two of the simplest yet most effective actions individuals and organisations can take to reduce cyber-security risk. Passwords remain a primary method of authentication across email, cloud services, corporate systems, and personal accounts, which makes them a frequent target for attackers. When passwords are weak, reused, or left unchanged for long periods, they significantly increase the likelihood of unauthorised access.
One of the main reasons for changing passwords periodically is that passwords can be compromised without the user knowing . Data breaches at third-party websites, phishing emails, malicious software, or insecure Wi-Fi networks can all expose credentials silently. If a password is changed regularly, the window of opportunity for an attacker to use stolen credentials is reduced. Even if a password is compromised, changing it invalidates the stolen information and prevents long-term access.
Password changes are particularly important because password reuse is extremely common . Many users reuse the same or similar passwords across work and personal systems. If one external service is breached, attackers often try the same credentials on corporate email, Microsoft 365, cloud platforms, or VPNs. Regular password changes help limit the damage caused by credential reuse and prevent attackers from maintaining persistent access.
Using a strong password is just as important as changing it. Strong passwords are long, unique, and unpredictable, making them far harder to guess or crack using automated tools. Weak passwords such as names, dates of birth, common words, or predictable patterns can be broken in seconds through brute-force or dictionary attacks. In contrast, strong passwords or passphrases dramatically increase the time and computing power required to crack them, often making attacks impractical.
A strong password also provides protection against credential-stuffing attacks , where attackers use large lists of previously breached usernames and passwords to attempt logins across many services. If each account has a unique, complex password, a breach of one system does not automatically compromise others. This is especially critical for high-risk accounts such as email, cloud admin roles, banking, and remote access systems.
Regarding frequency , best practice has evolved. Modern guidance recommends changing password.