what kind of passwords are most commonly exploited by cybercriminals?

February 23, 2026

Cybercriminals most often exploit simple, predictable, and reused passwords like “123456,” “password,” and short number sequences such as “123456789.” These are easy to guess with automated tools and often appear in massive leaked password databases, making them prime targets.

Most commonly exploited passwords

The passwords that get broken most often share a few clear traits: they are short, simple, and widely reused across multiple accounts. Attackers feed huge lists of these into automated tools to crack accounts in seconds.

Some of the most frequently exploited passwords include:

“123456” and “123456789” (repeatedly ranked as the world’s most common passwords).

Short numeric runs like “12345,” “12345678,” and “111111.”

Common words like “password,” “admin,” “secret,” and keyboard patterns like “qwerty123” or “qwerty1.”

These show up millions of times in breach datasets, which means attackers constantly test them first in brute-force and credential-stuffing attacks.

Why these passwords are so vulnerable

Cybercriminals rarely “guess” passwords one by one; they automate everything. Their tools:

Try huge lists of known weak passwords from past breaches (like “123456” or “password”).

Run through predictable patterns: simple numbers, keyboard sequences, names, and common words plus a digit, such as “Password1.”

Because many people reuse these same weak passwords on multiple sites, one breach can open the door to multiple accounts (email, banking, shopping, social media) via credential stuffing.

Patterns attackers love

Rather than only targeting exact strings, cybercriminals look for predictable patterns that humans like to use. Common examples:

Pure numbers: birthdays, phone fragments, or sequences like “000000,” “1234,” “202020.”

Keyboard walks: “qwerty,” “asdfgh,” “1q2w3e.”

Simple words or names: “maria,” “admin,” team names, or pet names, sometimes with “1” or “123” appended.

Attackers build dictionaries of these patterns and their variations, so they can test millions of them extremely quickly.

What actually counts as a strong password

Security research and incident analysis in 2024–2025 keep converging on the same idea: longer, random, and unique passwords are dramatically harder to crack. Key principles:

Length matters more than fancy characters: 15+ characters is strongly recommended.

Randomness beats “cleverness”: “P@ssw0rd123!” looks complex but follows predictable rules and often falls quickly.

Uniqueness per site prevents one breach from exposing all of your accounts.

Many experts now suggest either:

Using a password manager to generate long, random strings you never have to memorize.

Or using a longer passphrase made of several unrelated words, ideally 5+ words, not based on your life or common phrases.

Quick practical safeguards

To avoid having your passwords end up on those “most exploited” lists:

Change any password that is in or resembles the classics (“123456,” “password,” “qwerty,” “admin,” simple names or dates).

Turn on multi-factor authentication (MFA) wherever possible so a stolen password alone isn’t enough.

Use a password manager to create and store unique passwords for every account, especially for email, banking, and social media.

TL;DR: Cybercriminals feast on short, common, predictable, and reused passwords—especially numeric sequences and obvious words—because automated tools can crack them almost instantly.

Information gathered from public forums or data available on the internet and portrayed here.